[gtk] remove tests/testinput

[Timm Bäder <baedert src gnome org>]

commit ed8e78487982bdde3f1cf5ecb863a2385b3e934c
Author: Timm Bäder <mail baedert org>
Date:   Mon Aug 27 17:55:36 2018 +0200

    remove tests/testinput
    
    It's broken and almost the exact same thing as the drawing demo in
    gtk4-demo.

 tests/meson.build |   1 -
 tests/testinput.c | 314 ------------------------------------------------------
 2 files changed, 315 deletions(-)
---
diff --git a/tests/meson.build b/tests/meson.build
index 772dc23e49..16beab8d36 100644
--- a/tests/meson.build
+++ b/tests/meson.build
@@ -57,7 +57,6 @@ gtk_tests = [
   ['testicontheme'],
   ['testinfobar'],
   ['testimage'],
-  ['testinput'],
   ['testkineticscrolling'],
   ['testlist'],
   ['testlist2'],