Don't automatically build API wrappers if cmake version is 2.4

CMakeLists.txt

@@ -276,17 +276,15 @@ FIND_PROGRAM(GCCXML_PATH gccxml PATH
     /usr/local/bin
     "C:/Program Files/gccxml 0.9/bin"
 )
-IF(GCCXML_PATH AND JAVA_RUNTIME)
+IF(GCCXML_PATH AND JAVA_RUNTIME AND NOT cmv EQUAL "2.4")
     SET(OPENMM_BUILD_API_WRAPPERS ON CACHE BOOL "Build wrappers for C and Fortran")
-ELSE(GCCXML_PATH AND JAVA_RUNTIME)
+ELSE(GCCXML_PATH AND JAVA_RUNTIME AND NOT cmv EQUAL "2.4")
     SET(OPENMM_BUILD_API_WRAPPERS OFF CACHE BOOL "Build wrappers for C and Fortran")
-ENDIF(GCCXML_PATH AND JAVA_RUNTIME)
+ENDIF(GCCXML_PATH AND JAVA_RUNTIME AND NOT cmv EQUAL "2.4")
 IF(OPENMM_BUILD_API_WRAPPERS)
     ADD_SUBDIRECTORY(wrappers)
-    IF(NOT cmv EQUAL "2.4")
     SET(SOURCE_FILES ${SOURCE_FILES} wrappers/OpenMMCWrapper.cpp  wrappers/OpenMMFortranWrapper.cpp)
     SET_SOURCE_FILES_PROPERTIES(wrappers/OpenMMCWrapper.cpp wrappers/OpenMMFortranWrapper.cpp PROPERTIES GENERATED TRUE)
-    ENDIF(NOT cmv EQUAL "2.4")
 ENDIF(OPENMM_BUILD_API_WRAPPERS)
 
 INCLUDE_DIRECTORIES(BEFORE ${CMAKE_CURRENT_SOURCE_DIR}/src)