configure: use PKG_PROG_PKG_CONFIG
Since it enables cross-compilation by looking for a host triplet prefixed pkg-config binary, e.g. i686-pc-linux-gnu-pkg-config when passing --host=i686-pc-linux-gnu to cross-compile for x86 https://bugzilla.gnome.org/show_bug.cgi?id=748111
parent
0c468b56
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