Fix mac linking

indra/cmake/LLPhysicsExtensions.cmake

@@ -24,7 +24,11 @@ if (HAVOK)
    set(LLPHYSICSEXTENSIONS_INCLUDE_DIRS ${LIBS_PREBUILT_DIR}/include/llphysicsextensions) 
 elseif (HAVOK_TPV AND NOT LINUX)
    use_prebuilt_binary(llphysicsextensions_tpv)
-   set(LLPHYSICSEXTENSIONS_LIBRARIES    ${ARCH_PREBUILT_DIRS}/llphysicsextensions_tpv.lib)
+   if(WINDOWS)
+      set(LLPHYSICSEXTENSIONS_LIBRARIES    ${ARCH_PREBUILT_DIRS}/llphysicsextensions_tpv.lib)
+   else
+      set(LLPHYSICSEXTENSIONS_LIBRARIES    ${ARCH_PREBUILT_DIRS}/llphysicsextensions_tpv.a)
+   endif()
    set(LLPHYSICSEXTENSIONS_INCLUDE_DIRS ${LIBS_PREBUILT_DIR}/include/llphysicsextensions) 
 else (HAVOK)
   if (NOT USE_LL_STUBS)