ci: use gcc 15 for msys

Author: Totto16

.github/workflows/build.yml

@@ -135,19 +135,8 @@ jobs:
         uses: Totto16/msys2-install-packages-pinned@v1
         with:
           msystem: ${{matrix.config.environment == 'mingw' && 'MINGW64' || 'UCRT64'}}
-          # gcc-libs 14 don't provbide the virtual package cc-libs, only gcc-libs 15 (see https://github.com/msys2/MINGW-packages/commit/9fa882f7eb6f639780a13df016497a93e45544ac) provide it, so until we use gcc 15, nghttp3 < 1.10.1 needs to be used (see https://github.com/msys2/MINGW-packages/commit/16b7f94772f29f1c207764701d863d266a5de64c) since 1.10.1 needs cc-libs and not gcc-libs. The newest version matching that constraint is 1.9.0
-          # for the other pavckages see https://github.com/msys2/MINGW-packages/commit/62308009e77d772a126313626b194e503b0e5135
           install: |
-            nghttp3=1.9
-            SDL2=2.32.8
-            aom=3.12.0
-            curl=8.13.0
-            gnutls=3.8.8
-            libarchive=3.7.9
-            mpg123=1.32.9
-            ngtcp2=1.12.0
-            python=3.12.9-4
-            gcc=14 gcc-libs=!
+            gcc=15 gcc-libs=!
 
       - name: Setup Clang (Linux) (libc++)
         if: matrix.config.os == 'ubuntu' && matrix.config.use-clang == true && matrix.config.use-clang_stdlib

tools/options/meson.build

@@ -51,6 +51,11 @@ if get_option('run_in_ci')
         'checks': ['>=14', '<15'],
     }
 
+    gcc_15_compiler = {
+        'id': 'gcc',
+        'checks': ['>=15', '<16'],
+    }
+
     msvc_compiler_current = {
         'id': 'msvc',
         'checks': ['>=19.43', '<20'],
@@ -78,7 +83,7 @@ if get_option('run_in_ci')
             'compilers': [msvc_compiler_current],
         },
         'msys2': {
-            'compilers': [gcc_14_compiler],
+            'compilers': [gcc_15_compiler],
         },
         'linux': {
             'compilers': [clang_20_compiler, gcc_14_compiler],