pkg-config: Add URL and link math library

libcjson.pc.in

@@ -5,5 +5,7 @@ includedir=${prefix}/@includedir@
 Name: libcjson
 Version: @version@
 Description: Ultralightweight JSON parser in ANSI C
+URL: https://github.com/DaveGamble/cJSON
 Libs: -L${libdir} -lcjson
+Libs.Private: -lm
 Cflags: -I${includedir}

libcjson_utils.pc.in

@@ -5,6 +5,7 @@ includedir=${prefix}/@includedir@
 Name: libcjson_utils
 Version: @version@
 Description: An implementation of JSON Pointer, Patch and Merge Patch based on cJSON.
+URL: https://github.com/DaveGamble/cJSON
 Libs: -L${libdir} -lcjson_utils
 Cflags: -I${includedir}
 Requires: libcjson