[openwrt/openwrt] glibc: fix applying of patches

[LEDE Commits]

dedeckeh pushed a commit to openwrt/openwrt.git, branch master:
https://git.lede-project.org/3dee117a8a19d3d8dfdf63b63833b1b42175eeb0

commit 3dee117a8a19d3d8dfdf63b63833b1b42175eeb0
Author: Hans Dedecker <dedeckeh at gmail.com>
AuthorDate: Mon Mar 12 11:13:07 2018 +0100

    glibc: fix applying of patches
    
    Commit f4d9d7a removed support for version specific patches; but it also
    broke applying of patches in the patches glibc dir.
    Fix the issue by setting PATCH_DIR to $(PATH_PREFIX)/patches similar as
    musl/common.mk.
    
    Signed-off-by: Xinxing Hu <xinxing.huchn at gmail.com>
    Signed-off-by: Hans Dedecker <dedeckeh at gmail.com>
---
 toolchain/glibc/common.mk | 1 +
 1 file changed, 1 insertion(+)

diff --git a/toolchain/glibc/common.mk b/toolchain/glibc/common.mk
index 0ffeef0..090901e 100644
--- a/toolchain/glibc/common.mk
+++ b/toolchain/glibc/common.mk
@@ -16,6 +16,7 @@ PKG_HASH:=e54e0a934cd2bc94429be79da5e9385898d2306b9eaf3c92d5a77af96190f6bd
 PKG_SOURCE_SUBDIR:=$(PKG_NAME)-$(PKG_VERSION)
 HOST_BUILD_DIR:=$(BUILD_DIR_TOOLCHAIN)/$(PKG_SOURCE_SUBDIR)
 CUR_BUILD_DIR:=$(HOST_BUILD_DIR)-$(VARIANT)
+PATCH_DIR:=$(PATH_PREFIX)/patches
 
 include $(INCLUDE_DIR)/toolchain-build.mk