patches/openwrt: backport PKG_CONFIG_EXTRAARGS

patches/openwrt/to-upstream/0052-tools-pkgconf-add-PKG_CONFIG_EXTRAARGS-for-additiona.patch

+From a87ceaac9a2e18593a5dd8f857ddb8bc688c0a53 Mon Sep 17 00:00:00 2001
+From: Andre Heider <a.heider@gmail.com>
+Date: Tue, 19 Oct 2021 11:08:46 +0200
+Subject: [PATCH] tools/pkgconf: add PKG_CONFIG_EXTRAARGS for additional
+ arguments
+
+This can be used my the OpenWrt build system to pass additional
+arguments when required.
+
+Signed-off-by: Andre Heider <a.heider@gmail.com>
+(cherry picked from commit 0e411c69a819bf3c8a122d8421d6c1c0ded33ec8)
+---
+ tools/pkgconf/files/pkg-config | 3 ++-
+ 1 file changed, 2 insertions(+), 1 deletion(-)
+
+diff --git a/tools/pkgconf/files/pkg-config b/tools/pkgconf/files/pkg-config
+index 2c6fd08b4a..91d144d9b1 100755
+--- a/tools/pkgconf/files/pkg-config
++++ b/tools/pkgconf/files/pkg-config
+@@ -5,4 +5,5 @@ pkg-config.real \
+ --keep-system-libs \
+ --define-variable=prefix="${STAGING_PREFIX}" \
+ --define-variable=exec_prefix="${STAGING_PREFIX}" \
+---define-variable=bindir="${STAGING_PREFIX}/bin" "$@"
++--define-variable=bindir="${STAGING_PREFIX}/bin" \
++$PKG_CONFIG_EXTRAARGS "$@"
+-- 
+2.34.1
+