daemon: fix pkg-config check for mingw

Test if empty first, so we don't override mingw pkg-config directory.

Refs #56437

Change-Id: Ifb3c918a434aa697f81c92965cdb614b50728dc4

daemon/autogen.sh

@@ -6,11 +6,10 @@ if test -z $AUTORECONF; then
         exit 1
 fi
 
-PKGCONFIG=`which pkg-config`
-if test -z $PKGCONFIG; then
-        echo "*** No pkg-config found, please install it ***"
-        # warn without exiting, since pkg-config is only needed
-        # by configure, not autogen.sh
+if !"${PKG_CONFIG:-pkg-config}" --version >/dev/null 2>&1; then
+    echo "*** No pkg-config found, please install it ***"
+    # warn without exiting, since pkg-config is only needed
+    # by configure, not autogen.sh
 fi
 
 LIBTOOLIZE=`which libtoolize || which glibtoolize`