Update FindZLIB.cmake to version 2.6.1 + add MSYS path.

CMakeModules/FindZLIB.cmake

+#
+# From CMake 2.6.1 + some path changes
+#
+
 # - Find zlib
 # Find the native ZLIB includes and library
 #
@@ -16,38 +20,20 @@ IF (ZLIB_INCLUDE_DIR)
   SET(ZLIB_FIND_QUIETLY TRUE)
 ENDIF (ZLIB_INCLUDE_DIR)
 
-FIND_PATH(ZLIB_INCLUDE_DIR zlib.h
-  /usr/local/include
-  /usr/include
-  ${ZLIB_DIR_SEARCH}/local/include
-)
+FIND_PATH(ZLIB_INCLUDE_DIR zlib.h PATHS ${ZLIB_DIR_SEARCH}/local/include)
 
 SET(ZLIB_NAMES z zlib zdll)
-FIND_LIBRARY(ZLIB_LIBRARY
-  NAMES ${ZLIB_NAMES}
-  PATHS /usr/lib /usr/local/lib ${ZLIB_DIR_SEARCH}/local/lib
-)
+FIND_LIBRARY(ZLIB_LIBRARY NAMES ${ZLIB_NAMES} PATHS ${ZLIB_DIR_SEARCH}/local/lib)
 
-IF (ZLIB_INCLUDE_DIR AND ZLIB_LIBRARY)
-   SET(ZLIB_FOUND TRUE)
+# handle the QUIETLY and REQUIRED arguments and set ZLIB_FOUND to TRUE if 
+# all listed variables are TRUE
+INCLUDE(FindPackageHandleStandardArgs)
+FIND_PACKAGE_HANDLE_STANDARD_ARGS(ZLIB DEFAULT_MSG ZLIB_LIBRARY ZLIB_INCLUDE_DIR)
+
+IF(ZLIB_FOUND)
   SET( ZLIB_LIBRARIES ${ZLIB_LIBRARY} )
-ELSE (ZLIB_INCLUDE_DIR AND ZLIB_LIBRARY)
-   SET(ZLIB_FOUND FALSE)
+ELSE(ZLIB_FOUND)
   SET( ZLIB_LIBRARIES )
-ENDIF (ZLIB_INCLUDE_DIR AND ZLIB_LIBRARY)
-
-IF (ZLIB_FOUND)
-   IF (NOT ZLIB_FIND_QUIETLY)
-      MESSAGE(STATUS "Found ZLIB: ${ZLIB_LIBRARY}")
-   ENDIF (NOT ZLIB_FIND_QUIETLY)
-ELSE (ZLIB_FOUND)
-   IF (ZLIB_FIND_REQUIRED)
-      MESSAGE(STATUS "Looked for Z libraries named ${ZLIBS_NAMES}.")
-      MESSAGE(FATAL_ERROR "Could NOT find z library")
-   ENDIF (ZLIB_FIND_REQUIRED)
-ENDIF (ZLIB_FOUND)
-
-MARK_AS_ADVANCED(
-  ZLIB_LIBRARY
-  ZLIB_INCLUDE_DIR
-  )
+ENDIF(ZLIB_FOUND)
+
+MARK_AS_ADVANCED( ZLIB_LIBRARY ZLIB_INCLUDE_DIR )