From Philip Lowman, clean up of CMake files

CMakeModules/ModuleInstall.cmake

@@ -9,10 +9,10 @@ SET(INSTALL_BINDIR bin)
 IF(WIN32)
     SET(INSTALL_LIBDIR bin)
     SET(INSTALL_ARCHIVEDIR lib)
-ELSE(WIN32)
+ELSE()
     SET(INSTALL_LIBDIR lib${LIB_POSTFIX})
     SET(INSTALL_ARCHIVEDIR lib${LIB_POSTFIX})
-ENDIF(WIN32)
+ENDIF()
 
 SET(HEADERS_GROUP "Header Files")
 
@@ -23,7 +23,7 @@ SOURCE_GROUP(
 
 IF(MSVC AND OSG_MSVC_VERSIONED_DLL)
     HANDLE_MSVC_DLL()
-ENDIF(MSVC AND OSG_MSVC_VERSIONED_DLL)
+ENDIF()
 
 INSTALL(
     TARGETS ${LIB_NAME}