Add important 'Requires' fields to pc file

[q962]

luv/libluv.pc.in

Lines 8 to 12 in ae03877

	Description: Bare and full libuv bindings for Lua/LuaJIT.
	URL: https://github.com/luvit/luv
	Libs: -L${libdir} -lluv @LIBS@
	Cflags: -I${includedir}