lz4: change pkg-config .pc file name to liblz4.pc

packages/l/lz4/xmake.lua

@@ -24,6 +24,7 @@ package("lz4")
             add_rules("mode.debug", "mode.release")
             target("lz4")
                 set_kind("$(kind)")
+                add_rules("utils.install.pkgconfig_importfiles", {filename = "liblz4.pc"})
                 add_files("lib/*.c")
                 add_headerfiles("lib/lz4.h", "lib/lz4hc.h", "lib/lz4frame.h")
                 add_defines("XXH_NAMESPACE=LZ4_")