fix Mac linker script for @rpath libs (like SFML)

Homebrew SFML links itself with @rpath/ instead of the dylib path,
update the mac linking and bundling script to handle that case, also
move it from src/wx/tools/osx to tools/osx now that wx is the primary
port.

This fix is temporary and I will write a better one that takes
DYLD_LIBRARY_PATH and such into account, but will suffice for linking
Homebrew libs for now. The script needs more work in general.

src/wx/CMakeLists.txt

@@ -416,11 +416,11 @@ if(APPLE)
     SET(MACOSX_BUNDLE_ICON_FILE ${VBAM_ICON})
     SET_SOURCE_FILES_PROPERTIES(${VBAM_ICON_PATH} PROPERTIES MACOSX_PACKAGE_LOCATION Resources)
 
-    # budle dylibs and relink them for releasing .app
+    # bundle dylibs and relink them for releasing .app
     # but only in Release mode
     IF(NOT CMAKE_BUILD_TYPE STREQUAL "Debug")
         ADD_CUSTOM_COMMAND(TARGET visualboyadvance-m POST_BUILD
-            COMMAND ${CMAKE_CURRENT_SOURCE_DIR}/tools/osx/third_party_libs_tool "$<TARGET_FILE_DIR:visualboyadvance-m>/../..")
+            COMMAND ${CMAKE_SOURCE_DIR}/tools/osx/third_party_libs_tool "$<TARGET_FILE_DIR:visualboyadvance-m>/../..")
     ENDIF()
 endif(APPLE)
 

tools/osx/third_party_libs_tool

@@ -152,6 +152,13 @@ lib_scan() {
 
             [ "$lib" = "$bin" ] && continue
 
+            # check for libs already linked as @rpath/ which usually means /usr/local/lib/
+            case "$lib" in
+                '@rpath/'*)
+                    lib='/usr/local/lib'"${lib#@rpath}"
+                    ;;
+            esac
+
             echo "$lib"
             set -- "$@" "$lib"
         done