Adjust ssize_t check for Windows

Author: petk

cmake/cmake/ConfigureChecks.cmake

@@ -208,9 +208,13 @@ if(SIZEOF_SIZE_T STREQUAL "")
   set(SIZEOF_SIZE_T_CODE "#define SIZEOF_SIZE_T 0")
 endif()
 
-check_type_size("ssize_t" SIZEOF_SSIZE_T)
-if(SIZEOF_SSIZE_T STREQUAL "")
+if(CMAKE_SYSTEM_NAME STREQUAL "Windows")
   set(SIZEOF_SSIZE_T_CODE "#define SIZEOF_SSIZE_T 0")
+else()
+  check_type_size("ssize_t" SIZEOF_SSIZE_T)
+  if(SIZEOF_SSIZE_T STREQUAL "")
+    set(SIZEOF_SSIZE_T_CODE "#define SIZEOF_SSIZE_T 0")
+  endif()
 endif()
 
 check_type_size("uid_t" SIZEOF_UID_T)