mcpp: fix build with gcc14

srcpkgs/mcpp/patches/gcc14.patch

@@ -0,0 +1,25 @@
+From 3b274fe8f31d61996343b17402f30408a6e447cf Mon Sep 17 00:00:00 2001
+From: John Brandwood <john.brandwood@telzey.com>
+Date: Fri, 15 Mar 2024 15:15:53 -0400
+Subject: [PATCH] Fix build with GCC 14.x by splitting a NULL assignment into 2
+ lines.
+
+---
+ src/expand.c | 3 ++-
+ 1 file changed, 2 insertions(+), 1 deletion(-)
+
+diff --git a/src/expand.c b/src/expand.c
+index 08f829a..ea2d2a9 100644
+--- a/src/expand.c
++++ b/src/expand.c
+@@ -710,7 +710,8 @@ static char *   replace(
+         } else {
+             m_inf->locs.start_col = m_inf->locs.start_line = 0L;
+         }
+-        m_inf->args = m_inf->loc_args = NULL;       /* Default args */
++        m_inf->args = NULL;                         /* Default args */
++        m_inf->loc_args = NULL;
+         for (num = 1, recurs = 0; num < m_num; num++)
+             if (mac_inf[ num].defp == defp)
+                 recurs++;           /* Recursively nested macro     */
+