toolchain-external: fix bug #5054

The external toolchain logic checks (and finds) the proper ARCH_LIB_DIR
and forcibly copies it to */lib even if it's in */lib64
This is all well until the check is done for create_lib64_symlinks which
only verifies if ARCH_SYSROOT_DIR/lib64 is a symlink, which in some
toolchain it's a real directory (like sourcery x86_64 2012.09) and thus
doesn't make the symlink in the target.

Fix this by also checking for a real directory.

Easily reproducible by running "make qemu_x86_64_defconfig", switching
to an external toolchain before build, building and then trying to run
the resulting image.

Closes bug #5054

Signed-off-by: Gustavo Zacarias <gustavo@zacarias.com.ar>
Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>

CHANGES

@@ -6,6 +6,10 @@
 	libcurl, pulseaudio, python-nfc, qt5imageformats, strace,
 	wvstreams
 
+	Issues resolved (http://bugs.uclibc.org):
+
+	#5054: amd64: cannot find init - due to missing /lib64 folder
+
 2013.05-rc1, Released May 8th, 2013:
 
 	Architectures: ARC support, Blackfin support, FLAT binary

toolchain/toolchain-external/ext-tool.mk

@@ -446,7 +446,7 @@ $(STAMP_DIR)/ext-toolchain-installed: $(STAMP_DIR)/ext-toolchain-checked
 	fi ; \
 	$(call MESSAGE,"Copying external toolchain sysroot to staging...") ; \
 	$(call copy_toolchain_sysroot,$${SYSROOT_DIR},$${ARCH_SYSROOT_DIR},$${ARCH_SUBDIR},$${ARCH_LIB_DIR},$${SUPPORT_LIB_DIR}) ; \
-	if [ -L $${ARCH_SYSROOT_DIR}/lib64 ] ; then \
+	if [ -L $${ARCH_SYSROOT_DIR}/lib64 -o -d $${ARCH_SYSROOT_DIR}/lib64 ] ; then \
 		$(call create_lib64_symlinks) ; \
 	fi ; \
 	if test x"$(BR2_TOOLCHAIN_EXTERNAL_GDB_SERVER_COPY)" == x"y"; then \