xmoto: set correct worksrcdir, remove noop reinplace

games/xmoto/Portfile

@@ -18,7 +18,8 @@ long_description \
 
 homepage        http://xmoto.tuxfamily.org/
 master_sites    http://download.tuxfamily.org/xmoto/xmoto/${version}/
-distname        xmoto-${version}-src
+distname        ${name}-${version}-src
+worksrcdir      ${name}-${version}
 
 checksums       rmd160  4b005c37871489f54c16c9557e6a8556cd2121b4 \
                 sha256  a584a6f9292b184686b72c78f16de4b82d5c5b72ad89e41912ff50d03eca26b2
@@ -36,12 +37,6 @@ depends_lib     port:libpng \
                 port:curl \
                 port:libxdg-basedir
 
-post-patch {
-    # libpng 1.4 compatibility
-    reinplace "s/png_set_gray_1_2_4_to_8/png_set_expand_gray_1_2_4_to_8/" \
-        ${worksrcpath}/src/image/tim_png.cpp
-}
-
 configure.args-append --with-apple-opengl-framework --disable-sdltest
 
 # xmoto does not pick up flags for ode correctly, so we do this manually