[gimp] Issue #4189: Missing warnings on meson build.

[Jehan <jehanp src gnome org>]

commit 235b40e965aa5f278b8a6108c82d650c0394e220
Author: Jehan <jehan girinstud io>
Date:   Wed Nov 6 17:15:02 2019 +0100

    Issue #4189: Missing warnings on meson build.
    
    We want to see deprecation warnings. Otherwise we'll just never fix them
    if we are not constantly reminded of their existence.

 meson.build | 3 ---
 1 file changed, 3 deletions(-)
---
diff --git a/meson.build b/meson.build
index 6249e5fa79..c0ad060bd8 100644
--- a/meson.build
+++ b/meson.build
@@ -240,9 +240,6 @@ warning_cflags_common = [
   '-Wpointer-arith',
   '-Wreturn-type',
   '-Wtype-limits',
-
-  # You can uncomment this to debug with less warning outputs
-  '-Wno-deprecated-declarations',
 ]
 warning_cflags_c = [
   '-Wdeclaration-after-statement',