Always use lib64 for 64-bit and lib32 for 32-bit.

Do not change the dynamic linkers in any way, though.

When adding a new platform, fix this up too.

--- a/gcc/config/aarch64/t-aarch64-linux
+++ b/gcc/config/aarch64/t-aarch64-linux
@@ -22,7 +22,7 @@ LIB1ASMSRC   = aarch64/lib1funcs.asm
 LIB1ASMFUNCS = _aarch64_sync_cache_range
 
 AARCH_BE = $(if $(findstring TARGET_BIG_ENDIAN_DEFAULT=1, $(tm_defines)),_be)
-MULTILIB_OSDIRNAMES = mabi.lp64=../lib64$(call if_multiarch,:aarch64$(AARCH_BE)-linux-gnu)
+MULTILIB_OSDIRNAMES = mabi.lp64=../lib64
 MULTIARCH_DIRNAME = $(call if_multiarch,aarch64$(AARCH_BE)-linux-gnu)
 
 MULTILIB_OSDIRNAMES += mabi.ilp32=../libilp32$(call if_multiarch,:aarch64$(AARCH_BE)-linux-gnu_ilp32)
--- a/gcc/config/i386/t-linux64
+++ b/gcc/config/i386/t-linux64
@@ -33,6 +33,6 @@
 comma=,
 MULTILIB_OPTIONS    = $(subst $(comma),/,$(TM_MULTILIB_CONFIG))
 MULTILIB_DIRNAMES   = $(patsubst m%, %, $(subst /, ,$(MULTILIB_OPTIONS)))
-MULTILIB_OSDIRNAMES = m64=../lib64$(call if_multiarch,:x86_64-linux-gnu)
-MULTILIB_OSDIRNAMES+= m32=$(if $(wildcard $(shell echo $(SYSTEM_HEADER_DIR))/../../usr/lib32),../lib32,../lib)$(call if_multiarch,:i386-linux-gnu)
+MULTILIB_OSDIRNAMES = m64=../lib64
+MULTILIB_OSDIRNAMES+= m32=../lib32
 MULTILIB_OSDIRNAMES+= mx32=../libx32$(call if_multiarch,:x86_64-linux-gnux32)
--- a/gcc/config/mips/t-linux64
+++ b/gcc/config/mips/t-linux64
@@ -21,6 +21,6 @@ MULTILIB_DIRNAMES = n32 32 64
 MIPS_EL = $(if $(filter %el, $(firstword $(subst -, ,$(target)))),el)
 MIPS_SOFT = $(if $(strip $(filter MASK_SOFT_FLOAT_ABI, $(target_cpu_default)) $(filter soft, $(with_float))),soft)
 MULTILIB_OSDIRNAMES = \
-	../lib32$(call if_multiarch,:mips64$(MIPS_EL)-linux-gnuabin32$(MIPS_SOFT)) \
-	../lib$(call if_multiarch,:mips$(MIPS_EL)-linux-gnu$(MIPS_SOFT)) \
-	../lib64$(call if_multiarch,:mips64$(MIPS_EL)-linux-gnuabi64$(MIPS_SOFT))
+	../lib32 \
+	../lib \
+	../lib64
--- a/gcc/config/rs6000/t-linux
+++ b/gcc/config/rs6000/t-linux
@@ -2,7 +2,8 @@
 # or soft-float.
 ifeq (,$(filter $(with_cpu),$(SOFT_FLOAT_CPUS))$(findstring soft,$(with_float)))
 ifneq (,$(findstring powerpc64,$(target)))
-MULTILIB_OSDIRNAMES := .=../lib64$(call if_multiarch,:powerpc64-linux-gnu)
+MULTILIB_OSDIRNAMES := m64=../lib64
+MULTILIB_OSDIRNAMES += m32=../lib32
 else
 MULTIARCH_DIRNAME := $(call if_multiarch,powerpc-linux-gnu)
 endif
@@ -10,7 +11,8 @@ ifneq (,$(findstring powerpcle,$(target)
 MULTIARCH_DIRNAME := $(subst -linux,le-linux,$(MULTIARCH_DIRNAME))
 endif
 ifneq (,$(findstring powerpc64le,$(target)))
-MULTILIB_OSDIRNAMES := $(subst -linux,le-linux,$(MULTILIB_OSDIRNAMES))
+MULTILIB_OSDIRNAMES := m64=../lib64
+MULTILIB_OSDIRNAMES += m32=../lib32
 endif
 endif
 
--- a/gcc/config/rs6000/t-linux64
+++ b/gcc/config/rs6000/t-linux64
@@ -28,8 +28,8 @@
 MULTILIB_OPTIONS    := m64/m32
 MULTILIB_DIRNAMES   := 64 32
 MULTILIB_EXTRA_OPTS := 
-MULTILIB_OSDIRNAMES := m64=../lib64$(call if_multiarch,:powerpc64-linux-gnu)
-MULTILIB_OSDIRNAMES += m32=$(if $(wildcard $(shell echo $(SYSTEM_HEADER_DIR))/../../usr/lib32),../lib32,../lib)$(call if_multiarch,:powerpc-linux-gnu)
+MULTILIB_OSDIRNAMES := m64=../lib64
+MULTILIB_OSDIRNAMES += m32=../lib32
 
 rs6000-linux.o: $(srcdir)/config/rs6000/rs6000-linux.c
 	$(COMPILE) $<
--- a/gcc/config/rs6000/t-linux64bele
+++ b/gcc/config/rs6000/t-linux64bele
@@ -2,6 +2,6 @@
 
 MULTILIB_OPTIONS    += mlittle
 MULTILIB_DIRNAMES   += le
-MULTILIB_OSDIRNAMES += $(subst =,.mlittle=,$(subst lible32,lib32le,$(subst lible64,lib64le,$(subst lib,lible,$(subst -linux,le-linux,$(MULTILIB_OSDIRNAMES))))))
-MULTILIB_OSDIRNAMES += $(subst $(if $(findstring 64,$(target)),m64,m32).,,$(filter $(if $(findstring 64,$(target)),m64,m32).mlittle%,$(MULTILIB_OSDIRNAMES)))
+MULTILIB_OSDIRNAMES = m64=../lib64
+MULTILIB_OSDIRNAMES+= m32=../lib32
 MULTILIB_MATCHES    := ${MULTILIB_MATCHES_ENDIAN}
--- a/gcc/config/rs6000/t-linux64lebe
+++ b/gcc/config/rs6000/t-linux64lebe
@@ -2,6 +2,6 @@
 
 MULTILIB_OPTIONS    += mbig
 MULTILIB_DIRNAMES   += be
-MULTILIB_OSDIRNAMES += $(subst =,.mbig=,$(subst libbe32,lib32be,$(subst libbe64,lib64be,$(subst lib,libbe,$(subst le-linux,-linux,$(MULTILIB_OSDIRNAMES))))))
-MULTILIB_OSDIRNAMES += $(subst $(if $(findstring 64,$(target)),m64,m32).,,$(filter $(if $(findstring 64,$(target)),m64,m32).mbig%,$(MULTILIB_OSDIRNAMES)))
+MULTILIB_OSDIRNAMES := m64=../lib64
+MULTILIB_OSDIRNAMES += m32=../lib32
 MULTILIB_MATCHES    := ${MULTILIB_MATCHES_ENDIAN}
--- a/gcc/config/s390/t-linux64
+++ b/gcc/config/s390/t-linux64
@@ -7,5 +7,5 @@
 
 MULTILIB_OPTIONS = m64/m31
 MULTILIB_DIRNAMES = 64 32
-MULTILIB_OSDIRNAMES = ../lib64$(call if_multiarch,:s390x-linux-gnu)
-MULTILIB_OSDIRNAMES += $(if $(wildcard $(shell echo $(SYSTEM_HEADER_DIR))/../../usr/lib32),../lib32,../lib)$(call if_multiarch,:s390-linux-gnu)
+MULTILIB_OSDIRNAMES = m64=../lib64
+MULTILIB_OSDIRNAMES+= m32=../lib32
