Updated the test to not fail the build if a GPU is not available

tests/Tests/GlContexts/Glx/GlxContext.cs

@@ -41,7 +41,7 @@ namespace SkiaSharp.Tests
 				(glxMajor < 1) ||
 				(glxMajor == 1 && glxMinor < 3)) {
 				Destroy();
-				throw new Exception("GLX version 1.3 or higher required.");
+				throw new Exception($"GLX version 1.3 or higher required ({glxMajor}.{glxMinor} provided).");
 			}
 
 			var fbc = Glx.ChooseFBConfig(fDisplay, Xlib.XDefaultScreen(fDisplay), visualAttribs);

tests/Tests/SKTest.cs

@@ -89,15 +89,18 @@ namespace SkiaSharp.Tests
 
 		protected GlContext CreateGlContext()
 		{
-			TestGlVersion();
-
-			if (IsLinux) {
-				return new GlxContext();
-			} else if (IsMac) {
-				return new CglContext();
-			} else if (IsWindows) {
-				return new WglContext();
-			} else {
+			try {
+				if (IsLinux) {
+					return new GlxContext();
+				} else if (IsMac) {
+					return new CglContext();
+				} else if (IsWindows) {
+					return new WglContext();
+				} else {
+					return null;
+				}
+			} catch (Exception ex) {
+				Assert.Ignore("Unable to create GL context: " + ex.Message);
 				return null;
 			}
 		}