jpeg2png: fix build with gcc

graphics/jpeg2png/Portfile

@@ -26,6 +26,9 @@ depends_lib-append  port:libjpeg-turbo \
                     port:libpng \
                     port:zlib
 
+# https://github.com/ThioJoe/jpeg2png/pull/3
+patchfiles-append   patch-static_assert.diff
+
 post-patch {
     # remove the implicit variable reset
     system -W ${worksrcpath} "sed -i '' '3,8d' Makefile"

graphics/jpeg2png/files/patch-static_assert.diff

@@ -0,0 +1,26 @@
+From 76e2d331f566bcbbeba121648e94607d12ca420b Mon Sep 17 00:00:00 2001
+From: Sergey Fedorov <[email protected]>
+Date: Sat, 14 Dec 2024 23:38:44 +0800
+Subject: [PATCH] compute.c: fix static_assert for gcc
+
+---
+ compute.c | 6 ++++++
+ 1 file changed, 6 insertions(+)
+
+diff --git compute.c compute.c
+index a3d6e47..9ba3ac2 100644
+--- compute.c
++++ compute.c
+@@ -12,6 +12,12 @@
+
+ #include "ooura/dct.h"
+
++#if !defined(static_assert) && (defined(__GNUC__) || defined(__clang__)) \
++    && defined(__STDC_VERSION__) && __STDC_VERSION__ >= 201112L \
++    && __STDC_VERSION__ <= 201710L
++#define static_assert _Static_assert
++#endif
++
+ static_assert(FLT_EVAL_METHOD == 0, "to preserve identical output please disable excess precision");
+ #ifdef PRAGMA_FP_CONTRACT
+ #pragma STDC FP_CONTRACT OFF