patch 8.0.1132: #if condition is not portable

Problem:    #if condition is not portable.
Solution:   Add defined(). (Zuloloxi, closes #2136)

Author: brammool

src/libvterm/src/vterm.c

@@ -130,7 +130,8 @@ static int outbuffer_is_full(VTerm *vt)
   return vt->outbuffer_cur >= vt->outbuffer_len - 1;
 }
 
-#if _XOPEN_SOURCE >= 500 || _ISOC99_SOURCE || _BSD_SOURCE
+#if (defined(_XOPEN_SOURCE) && _XOPEN_SOURCE >= 500) \
+	|| defined(_ISOC99_SOURCE) || defined(_BSD_SOURCE)
 # undef VSNPRINTF
 # define VSNPRINTF vsnprintf
 #else

src/version.c

@@ -761,6 +761,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    1132,
 /**/
     1131,
 /**/