mesa3d: patch to support wayland-scanner (#420)

Author: HaseenaSainul

package/mesa3d/21.1.8/0007-meson-use-wayland-scanner-provided-by-wayland-scanner.patch

@@ -0,0 +1,52 @@
+From 0e107f7bac8d84d8fb2bb5b83bfb4474348a82c1 Mon Sep 17 00:00:00 2001
+From: Romain Naour <[email protected]>
+Date: Wed, 17 Apr 2019 22:47:05 +0200
+Subject: [PATCH] meson: use wayland-scanner provided by wayland-scanner-path
+
+When cross-compiling the .pc file might point to the wrong
+wayland-scanner binary (target rather than host) resulting in a
+non-executable and wrong scanner.
+First try by using the path provided by wayland-scanner-path,
+and if that fails fall back into pkg-config.
+
+Based on the patch for autotools provided by Gustavo Zacarias.
+
+Signed-off-by: Romain Naour <[email protected]>
+---
+ meson.build       | 5 ++++-
+ meson_options.txt | 6 ++++++
+ 2 files changed, 10 insertions(+), 1 deletion(-)
+
+diff --git a/meson.build b/meson.build
+index 6c4f1508855..ef0532b2cfb 100644
+--- a/meson.build
++++ b/meson.build
+@@ -1319,7 +1319,10 @@ endif
+ 
+ if with_platform_wayland
+   dep_wl_scanner = dependency('wayland-scanner', native: true)
+-  prog_wl_scanner = find_program(dep_wl_scanner.get_pkgconfig_variable('wayland_scanner'))
++  prog_wl_scanner = get_option('wayland-scanner-path')
++  if prog_wl_scanner == ''
++    prog_wl_scanner = find_program(dep_wl_scanner.get_pkgconfig_variable('wayland_scanner'))
++  endif
+   if dep_wl_scanner.version().version_compare('>= 1.15')
+     wl_scanner_arg = 'private-code'
+   else
+diff --git a/meson_options.txt b/meson_options.txt
+index ccf70659ff7..59ff8df8337 100644
+--- a/meson_options.txt
++++ b/meson_options.txt
+@@ -324,3 +324,9 @@ option(
+   value : true,
+   description : 'Enable direct rendering in GLX and EGL for DRI',
+ )
++option(
++  'wayland-scanner-path',
++  type : 'string',
++  value : '',
++  description : 'Locations to wayland-scanner binary. Default: use path from pkg-config'
++)
+-- 
+2.20.1
+