define libc_cv_slibdir, fixes mips64 compilation (#5011)

SVN-Revision: 15526

toolchain/eglibc/Makefile

@@ -51,6 +51,7 @@ EGLIBC_CONFIGURE:= \
 	BUILD_CC="$(HOSTCC)" \
 	$(TARGET_CONFIGURE_OPTS) \
 	CFLAGS="$(EGLIBC_CFLAGS)" \
+	libc_cv_slibdir="/lib" \
 	$(HOST_BUILD_DIR)/libc/configure \
 		--prefix=/usr \
 		--build=$(GNU_HOST_NAME) \

toolchain/glibc/Makefile

@@ -52,6 +52,7 @@ GLIBC_CONFIGURE:= \
 	libc_cv_forced_unwind=yes \
 	libc_cv_c_cleanup=yes \
 	libc_cv_386_tls=yes \
+	libc_cv_slibdir="/lib" \
 	$(HOST_BUILD_DIR)/configure \
 		--prefix=/usr \
 		--build=$(GNU_HOST_NAME) \