Fix --enable-multilib for Newlib toolchain

You now need to explicitly pass this flag to turn on multilib support.

Makefile.in

@@ -159,8 +159,8 @@ stamps/build-gcc-linux-stage1: src/gcc stamps/build-binutils-linux \
 		--disable-libquadmath \
 		--disable-libgomp \
 		--disable-nls \
-		$(MULTILIB_FLAGS) \
 		--disable-bootstrap \
+		$(MULTILIB_FLAGS) \
 		$(WITH_ARCH)
 	$(MAKE) -C $(notdir $@) inhibit-libc=true all-gcc
 	$(MAKE) -C $(notdir $@) inhibit-libc=true install-gcc
@@ -226,6 +226,7 @@ stamps/build-gcc-newlib: src/newlib-gcc stamps/build-binutils-newlib
 		--disable-libquadmath \
 		--disable-libgomp \
 		--disable-nls \
+		$(MULTILIB_FLAGS) \
 		$(WITH_ARCH)
 	$(MAKE) -C $(notdir $@) inhibit-libc=true
 	$(MAKE) -C $(notdir $@) install

configure

@@ -1280,7 +1280,7 @@ Optional Features:
                           [--enable-atomic]
   --disable-float         use software floating point in glibc
                           [--enable-float]
-  --enable-multilib       build multilib glibc (32 and 64 bit)
+  --enable-multilib       build both RV32 and RV64 runtime libraries
                           [--disable-multilib]
 
 Optional Packages:

configure.ac

@@ -89,7 +89,7 @@ AC_SUBST(glibc_configure_flags,--without-fp)])
 
 AC_ARG_ENABLE(multilib,
 	[AS_HELP_STRING([--enable-multilib],
-		[build multilib glibc (32 and 64 bit) @<:@--disable-multilib@:>@])],
+		[build both RV32 and RV64 runtime libraries @<:@--disable-multilib@:>@])],
 	[],
 	[enable_multilib=no]
 	)