libnotify: Fix build with latest compilers

mingw-w64-libnotify/PKGBUILD

@@ -5,7 +5,7 @@ _realname=libnotify
 pkgbase=mingw-w64-${_realname}
 pkgname=("${MINGW_PACKAGE_PREFIX}-${_realname}")
 pkgver=0.7.12
-pkgrel=2
+pkgrel=3
 pkgdesc="Desktop notification library (mingw-w64)"
 arch=('any')
 mingw_arch=('mingw64' 'ucrt64' 'clang64' 'clangarm64')
@@ -40,6 +40,7 @@ prepare() {
 build() {
   mkdir -p "${srcdir}"/build-${MSYSTEM} && cd "${srcdir}"/build-${MSYSTEM}
 
+  CFLAGS+=" -Wno-implicit-function-declaration" \
   MSYS2_ARG_CONV_EXCL="--prefix=" \
     ${MINGW_PREFIX}/bin/meson.exe \
       --prefix="${MINGW_PREFIX}" \
@@ -61,5 +62,6 @@ package() {
 
   ${MINGW_PREFIX}/bin/meson.exe install --destdir="${pkgdir}"
 
-  install -Dm644 "${srcdir}/${_realname}-${pkgver}/COPYING" "${pkgdir}${MINGW_PREFIX}/share/licenses/${_realname}/COPYING"
+  install -Dm644 "${srcdir}"/${_realname}-${pkgver}/COPYING \
+    "${pkgdir}"${MINGW_PREFIX}/share/licenses/${_realname}/COPYING
 }