Fix pkgconfig file wrt last added dependencies

libz and libcrypto dependencies were added recently while libgit2.pc
did not get updated.

Signed-off-by: Steve Frécinaux <code@istique.net>
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>

libgit2.pc.in

@@ -6,6 +6,6 @@ includedir=${prefix}/include
 Name: libgit2
 Description: The git library, take 2
 Version: 0.0.1
-Requires: 
-Libs: -L${libdir} -lgit2
+Requires: libcrypto
+Libs: -L${libdir} -lgit2 -lz -lcrypto
 Cflags: -I${includedir}