Fix: mmap() support was enabled in all cases.

DefineOptions.cmake

@@ -86,7 +86,7 @@ endif(BLOCKS_ORGANIZATION STREQUAL "dll")
 
 if(WITH_SYSTEM_CALLS STREQUAL "mmap")
   set(WITH_MMAP ON)
-elseif(WITH_SYSTEM_CALLS STREQUAL "sbrk")
+else(WITH_SYSTEM_CALLS STREQUAL "mmap")
   set(WITH_MMAP OFF)
 endif(WITH_SYSTEM_CALLS STREQUAL "mmap")