[gimp] Require gtk+-3.0 in gimpui-3.0.pc

[Michael Schumacher <schumaml src gnome org>]

commit 001a8d0c669f9a3ca3f5e990c1571d77d28f8cf1
Author: Michael Schumacher <schumaml gmx de>
Date:   Fri May 25 21:55:45 2018 +0200

    Require gtk+-3.0 in gimpui-3.0.pc
    
    Fixes #1505

 gimpui.pc.in | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/gimpui.pc.in b/gimpui.pc.in
index 4789223460..e1515e301b 100644
--- a/gimpui.pc.in
+++ b/gimpui.pc.in
@@ -6,6 +6,6 @@ includedir=@includedir@
 Name: GIMP UI
 Description: GIMP User Interface Library
 Version: @GIMP_REAL_VERSION@
-Requires: gimp-@GIMP_PKGCONFIG_VERSION@ >= @GIMP_APP_VERSION@ gtk+-2.0 >= @GTK_REQUIRED_VERSION@
+Requires: gimp-@GIMP_PKGCONFIG_VERSION@ >= @GIMP_APP_VERSION@ gtk+-3.0 >= @GTK_REQUIRED_VERSION@
 Libs: -L${libdir} -lgimpui-@GIMP_API_VERSION@ -lgimpwidgets-@GIMP_API_VERSION@ 
-lgimpmodule-@GIMP_API_VERSION@
 Cflags: -I${includedir}/gimp-@GIMP_API_VERSION@