cmake: XercesMutexMgrSelection: Use XERCES_USE_MUTEXMGR_NOTHREAD

git-svn-id: https://svn.apache.org/repos/asf/xerces/c/trunk@1820309 13f79535-47bb-0310-9956-ffa450edef68
diff --git a/cmake/XercesMutexMgrSelection.cmake b/cmake/XercesMutexMgrSelection.cmake
index 6f08a0d..4782d6c 100644
--- a/cmake/XercesMutexMgrSelection.cmake
+++ b/cmake/XercesMutexMgrSelection.cmake
@@ -51,13 +51,13 @@
 
 set(XERCES_USE_MUTEXMGR_POSIX 0)
 set(XERCES_USE_MUTEXMGR_WINDOWS 0)
-set(XERCES_USE_MUTEXMGR_NOTHREADS 0)
+set(XERCES_USE_MUTEXMGR_NOTHREAD 0)
 if(mutexmgr STREQUAL "POSIX")
   set(XERCES_USE_MUTEXMGR_POSIX 1)
 elseif(mutexmgr STREQUAL "windows")
   set(XERCES_USE_MUTEXMGR_WINDOWS 1)
 elseif(mutexmgr STREQUAL "nothreads")
-  set(XERCES_USE_MUTEXMGR_NOTHREADS 1)
+  set(XERCES_USE_MUTEXMGR_NOTHREAD 1)
 else()
   message(FATAL_ERROR "Invalid mutex manager: \"${mutexmgr}\"")
 endif()