[balsa/wip/gtk4] Gtk+ is now Gtk

[Peter Bloomfield <peterb src gnome org>]

commit 7059994d9639fe6fdbbd85982165e8bb14af51e5
Author: Peter Bloomfield <PeterBloomfield bellsouth net>
Date:   Wed Feb 20 10:29:06 2019 -0500

    Gtk+ is now Gtk
    
    and the pkg-config file is just gtk4.pc

 configure.ac | 4 ++--
 meson.build  | 2 +-
 2 files changed, 3 insertions(+), 3 deletions(-)
---
diff --git a/configure.ac b/configure.ac
index 7ac60a70e..f917d1bf8 100644
--- a/configure.ac
+++ b/configure.ac
@@ -230,7 +230,7 @@ dnl #####################################################################
 
 PKG_CHECK_MODULES(BALSA, [
 glib-2.0 >= 2.56.0
-gtk+-4.0
+gtk4
 gmime-2.6
 gio-2.0
 gthread-2.0
@@ -240,7 +240,7 @@ fribidi
 
 PKG_CHECK_MODULES(BALSA_AB, [
    glib-2.0
-   gtk+-4.0
+   gtk4
    gmime-2.6
 ])
 
diff --git a/meson.build b/meson.build
index 1b120fc65..80dae1b74 100644
--- a/meson.build
+++ b/meson.build
@@ -128,7 +128,7 @@ conf.set('TOOLKIT_CATEGORIES', TOOLKIT_CATEGORIES)
 
 # Dependencies for balsa and balsa_ab:
 glib_dep    = dependency('glib-2.0', version : '>= 2.56.0')
-gtk_dep     = dependency('gtk+-4.0')
+gtk_dep     = dependency('gtk4')
 gmime_dep   = dependency('gmime-2.6')
 gio_dep     = dependency('gio-2.0')
 gthread_dep = dependency('gthread-2.0')