Force Mesa to use its own call

Mesa does not support adaptive swapping but will sometimes report that
it does.  This prevents Mesa drivers from testing (and segfaulting) the
limits of their call

Fixes https://gitlab.com/kicad/code/kicad/issues/10069

include/gl_utils.h

@@ -47,12 +47,16 @@ public:
 
         Display *dpy = glXGetCurrentDisplay();
         GLXDrawable drawable = glXGetCurrentDrawable();
+        std::string vendor( reinterpret_cast<const char*>( glGetString( GL_VENDOR ) ) );
+        bool is_mesa = ( vendor.find( "Mesa" ) != std::string::npos );
 
-        if( glXSwapIntervalEXT && glXQueryDrawable && dpy && drawable )
+        if( !is_mesa && glXSwapIntervalEXT && glXQueryDrawable && dpy && drawable )
         {
+            std::string exts( glXQueryExtensionsString( dpy, DefaultScreen( dpy ) ) );
+
             if( aVal < 0 )
             {
-                if( !wxGLCanvas::IsExtensionSupported( "GLX_EXT_swap_control_tear" ) )
+                if( exts.find( "GLX_EXT_swap_control_tear" ) == std::string::npos )
                 {
                     aVal = 0;
                 }
@@ -62,7 +66,7 @@ public:
                     // we need to be sure that late/adaptive swaps are
                     // enabled on the drawable.
 
-                    unsigned lateSwapsEnabled;
+                    unsigned lateSwapsEnabled = 0;
                     glXQueryDrawable( dpy, drawable, GLX_LATE_SWAPS_TEAR_EXT, &lateSwapsEnabled );
 
                     if( !lateSwapsEnabled )