build: add alternative PKG_CONFIG_PATH

build: add alternative PKG_CONFIG_PATH

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udev Makefile.am has two different .pc files and put them
into two locations. Don't know if changing the udev Makefile
or changing the pkgconfig paths is the right way - someone
has to decide :)

udev and vala use an additional pkg-config dir
add it to the path

discovered because openobex did not find udev.pc

Signed-off-by: Dirk Neukirchen <dirkneukirchen@web.de>
git-svn-id: svn://svn.openwrt.org/openwrt/trunk@39792 3c298f89-4303-0410-b956-a3cf2f4a3e73