git: fb107dc4b6c8 - main - graphics/mesa-libs: fix build on powerpc64le

The branch main has been updated by pkubaj:

URL: https://cgit.FreeBSD.org/ports/commit/?id=fb107dc4b6c89ed020a5377b5f3281f445dd954f

commit fb107dc4b6c89ed020a5377b5f3281f445dd954f
Author:     Piotr Kubaj <pkubaj@FreeBSD.org>
AuthorDate: 2023-11-23 23:25:14 +0000
Commit:     Piotr Kubaj <pkubaj@FreeBSD.org>
CommitDate: 2023-11-24 22:29:41 +0000

    graphics/mesa-libs: fix build on powerpc64le
    
    Checking if "POWER8 intrinsics" compiles: NO
    
    meson.build:720:6: ERROR: Problem encountered: POWER8 intrinsic support required but not found.
---
 graphics/mesa-dri/files/patch-meson.build | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/graphics/mesa-dri/files/patch-meson.build b/graphics/mesa-dri/files/patch-meson.build
new file mode 100644
index 000000000000..b94c2e4dd7ba
--- /dev/null
+++ b/graphics/mesa-dri/files/patch-meson.build
@@ -0,0 +1,11 @@
+--- meson.build.orig	2023-09-20 17:15:34 UTC
++++ meson.build
+@@ -709,7 +709,7 @@ if _power8.allowed()
+         int main() {
+           vector unsigned char r;
+           vector unsigned int v = vec_splat_u32 (1);
+-          r = __builtin_vec_vgbbd ((vector unsigned char) v);
++          r = __builtin_altivec_vgbbd ((vector unsigned char) v);
+           return 0;
+         }''',
+         args : '-mpower8-vector',