Revert "[toolchain/eglibc} eglibc in fact can be built with -Os"

Compiling with -Os results in: "error: #error "glibc cannot be compiled without optimization"

Still, building with -Os is listed as feature in
<http://www.eglibc.org/features>:

""
Building with -Os
     EGLIBC supports building the library with compiler optimizing for size -Os instead of for speed -O2.
""

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@27245 3c298f89-4303-0410-b956-a3cf2f4a3e73

toolchain/eglibc/Makefile

@@ -55,6 +55,10 @@ HOST_STAMP_INSTALLED:=$(TOOLCHAIN_DIR)/stamp/.eglibc_installed
 HOST_BUILD_DIR1:=$(HOST_BUILD_DIR)-initial
 HOST_BUILD_DIR2:=$(HOST_BUILD_DIR)-final
 
+# XXX: {e,}glibc does not build w/ -Os
+# http://sourceware.org/bugzilla/show_bug.cgi?id=5203
+EGLIBC_CFLAGS:=$(subst -Os,-O2,$(TARGET_CFLAGS))
+
 EGLIBC_CONFIGURE:= \
 	BUILD_CC="$(HOSTCC)" \
 	$(TARGET_CONFIGURE_OPTS) \