tests: Only run buffer-count test on Mesa >= 10.1

Comment #2 in the bug report says Mesa 10.0 branch does not have the
fix, and indeed buffer-count test fails on Mesa 10.0.1. Fix the test to
require Mesa 10.1 or later.

Now I correctly get:
	mesa version too old (OpenGL ES 3.0 Mesa 10.0.1 (git-12484d2))

https://bugs.freedesktop.org/show_bug.cgi?id=72835

Signed-off-by: Pekka Paalanen <pekka.paalanen@collabora.co.uk>

tests/buffer-count-test.c

@@ -97,7 +97,7 @@ init_egl(struct test_data *test_data)
 			     test_data->egl_surface, test_data->egl_ctx);
 	assert(ret == EGL_TRUE);
 
-	/* This test is specific to mesa 10.0 and later, which is the
+	/* This test is specific to mesa 10.1 and later, which is the
 	 * first release that doesn't accidentally triple-buffer. */
 	str = (const char *) glGetString(GL_VERSION);
 	mesa = strstr(str, "Mesa ");
@@ -105,7 +105,7 @@ init_egl(struct test_data *test_data)
 		skip("unknown EGL implementation (%s)\n", str);
 	if (sscanf(mesa + 5, "%d.%d", &major, &minor) != 2)
 		skip("unrecognized mesa version (%s)\n", str);
-	if (major < 10)
+	if (major < 10 || (major == 10 && minor < 1))
 		skip("mesa version too old (%s)\n", str);
 
 }