glibc: use default PATCH_DIR

Version configuration is gone, so version specific patch directories are
not necessary either.

Signed-off-by: Felix Fietkau <nbd@nbd.name>

toolchain/glibc/common.mk

@@ -19,8 +19,6 @@ PKG_SOURCE:=$(PKG_SOURCE_SUBDIR).tar.bz2
 
 GLIBC_PATH:=
 
-PATCH_DIR:=$(PATH_PREFIX)/patches/$(PKG_VERSION)
-
 HOST_BUILD_DIR:=$(BUILD_DIR_TOOLCHAIN)/$(PKG_SOURCE_SUBDIR)
 CUR_BUILD_DIR:=$(HOST_BUILD_DIR)-$(VARIANT)