community/glew: fix libdir in glew.pc
Patchset from Sebastian sebastian@sebsite.pw via aports #3915:
By default, glew sets the libdir in the pkg-config file to the LIBDIR
that it is installed to. We don't want that here, so this commit patches
the pkg-config file to always use the system's libdir (/usr/lib).
Signed-off-by: Sebastian <sebastian@sebsite.pw>