nghttp2: Add Cflags.private in pkgconfig file

This defines NGHTTP2_STATICLIB macro for static linking.

mingw-w64-nghttp2/002-nghttp2-pkgconfig-add-cflags-private.patch

@@ -0,0 +1,7 @@
+--- a/lib/libnghttp2.pc.in
++++ b/lib/libnghttp2.pc.in
+@@ -31,3 +31,4 @@
+ Version: @VERSION@
+ Libs: -L${libdir} -lnghttp2
+ Cflags: -I${includedir}
++Cflags.private: -DNGHTTP2_STATICLIB

mingw-w64-nghttp2/PKGBUILD

@@ -4,7 +4,7 @@ _realname=nghttp2
 pkgbase=mingw-w64-${_realname}
 pkgname=("${MINGW_PACKAGE_PREFIX}-${_realname}")
 pkgver=1.61.0
-pkgrel=1
+pkgrel=2
 pkgdesc="Framing layer of HTTP/2 is implemented as a reusable C library (mingw-w64)"
 arch=('any')
 mingw_arch=('mingw32' 'mingw64' 'ucrt64' 'clang64' 'clang32' 'clangarm64')
@@ -22,14 +22,17 @@ makedepends=(
 )
 license=('spdx:MIT')
 source=("https://github.com/nghttp2/nghttp2/releases/download/v${pkgver}/${_realname}-${pkgver}.tar.xz"
-        "001-fix-pc-prefix.patch")
+        "001-fix-pc-prefix.patch"
+        "002-nghttp2-pkgconfig-add-cflags-private.patch")
 sha256sums=('c0e660175b9dc429f11d25b9507a834fb752eea9135ab420bb7cb7e9dbcc9654'
-            'baf901e7d565eaea1133d30b13620b02681ce96ebe56d38e1dea4394299106b6')
+            'baf901e7d565eaea1133d30b13620b02681ce96ebe56d38e1dea4394299106b6'
+            'd82d0b5b32e26955c99ef70e129b33696fee01ad9a9a4e5d0fb98951fb5d0f22')
 
 prepare() {
   cd $srcdir/${_realname}-${pkgver}
 
   patch -Nbp1 -i "${srcdir}/001-fix-pc-prefix.patch"
+  patch -Nbp1 -i "${srcdir}/002-nghttp2-pkgconfig-add-cflags-private.patch"
 }
 
 build() {