Have Splint honor $TMPDIR.

--- splint-3.1.2/src/context.c	2004-07-31 21:04:26.000000000 +0200
+++ splint-3.1.2/src/context.c	2008-07-11 10:55:16.000000000 +0200
@@ -801,7 +801,10 @@ context_resetAllFlags (void) 
                 val = cstring_makeLiteral (env != NULL ? env : DEFAULT_TMPDIR);
 	      }
 # else
-	      val = cstring_makeLiteral (DEFAULT_TMPDIR);
+	      {
+		char *env = getenv ("TMPDIR");
+		val = cstring_makeLiteral (env != NULL ? env : DEFAULT_TMPDIR);
+	      }
 # endif /* !defined(OS2) && !defined(MSDOS) */
 
 	      break;