Disable PhysFS tests. For some reason they tried to build by default on Mac.

CMake/ExternalPhysFS.cmake

@@ -7,6 +7,8 @@ SET(physfs_CMAKE_ARGS
     -DCMAKE_INSTALL_PREFIX:PATH=<INSTALL_DIR> 
     -DCMAKE_BUILD_TYPE=${CMAKE_BUILD_TYPE}
     -DCMAKE_DEBUG_POSTFIX=d
+    -DPHYSFS_BUILD_TEST=FALSE
+    -DPHYSFS_BUILD_WX_TEST=FALSE
 )
 
 ExternalProject_Add(physfs
@@ -21,5 +23,3 @@ ExternalProject_Add(physfs
     CMAKE_ARGS ${physfs_CMAKE_ARGS}
 )
 
-
-