cmake: Add helper module for finding Lua

This is mostly for win32-specific files

cmake/Modules/FindLuajit.cmake

@@ -0,0 +1,84 @@
+# Once done these will be defined:
+#
+#  LUAJIT_FOUND
+#  LUAJIT_INCLUDE_DIRS
+#  LUAJIT_LIBRARIES
+#
+# For use in OBS: 
+#
+#  LUAJIT_INCLUDE_DIR
+
+IF(CMAKE_SIZEOF_VOID_P EQUAL 8)
+	SET(_LIB_SUFFIX 64)
+ELSE()
+	SET(_LIB_SUFFIX 32)
+ENDIF()
+
+FIND_PATH(LUAJIT_INCLUDE_DIR
+	NAMES lua.h
+	HINTS
+		ENV LuajitPath${_LIB_SUFFIX}
+		ENV LuajitPath
+		ENV DepsPath${_LIB_SUFFIX}
+		ENV DepsPath
+		${LuajitPath${_LIB_SUFFIX}}
+		${LuajitPath}
+		${DepsPath${_LIB_SUFFIX}}
+		${DepsPath}
+		${_LUAJIT_INCLUDE_DIRS}
+	PATHS
+		/usr/include
+		/usr/local/include
+		/opt/local/include
+		/opt/local
+		/sw/include
+		~/Library/Frameworks
+		/Library/Frameworks
+	PATH_SUFFIXES
+		include
+		luajit
+		luajit/src
+		include/luajit
+		include/luajit/src
+		luajit-2.0
+		include/luajit-2.0
+		luajit2.0
+		include/luajit2.0
+		)
+
+find_library(LUAJIT_LIB
+	NAMES ${_LUAJIT_LIBRARIES} luajit luajit-51 luajit-5.1
+	HINTS
+		ENV LuajitPath${_lib_suffix}
+		ENV LuajitPath
+		ENV DepsPath${_lib_suffix}
+		ENV DepsPath
+		${LuajitPath${_lib_suffix}}
+		${LuajitPath}
+		${DepsPath${_lib_suffix}}
+		${DepsPath}
+		${_LUAJIT_LIBRARY_DIRS}
+	PATHS
+		/usr/lib
+		/usr/local/lib
+		/opt/local/lib
+		/opt/local
+		/sw/lib
+		~/Library/Frameworks
+		/Library/Frameworks
+	PATH_SUFFIXES
+		lib${_lib_suffix} lib
+		libs${_lib_suffix} libs
+		bin${_lib_suffix} bin
+		../lib${_lib_suffix} ../lib
+		../libs${_lib_suffix} ../libs
+		../bin${_lib_suffix} ../bin)
+
+include(FindPackageHandleStandardArgs)
+find_package_handle_standard_args(Luajit DEFAULT_MSG LUAJIT_LIB LUAJIT_INCLUDE_DIR)
+mark_as_advanced(LUAJIT_INCLUDE_DIR LUAJIT_LIB)
+
+if(LUAJIT_FOUND)
+	set(LUAJIT_INCLUDE_DIRS ${LUAJIT_INCLUDE_DIR})
+	set(LUAJIT_LIBRARIES ${LUAJIT_LIB})
+endif()