[vte] build: Fix gtk4-only build

[Christian Persch <chpe src gnome org>]

commit d9fbea1835a71b5d023b7123e285f691faa4faea
Author: Christian Persch <chpe src gnome org>
Date:   Tue Apr 27 22:43:30 2021 +0200

    build: Fix gtk4-only build

 src/meson.build | 26 ++++++++++++++------------
 1 file changed, 14 insertions(+), 12 deletions(-)
---
diff --git a/src/meson.build b/src/meson.build
index e9192be0..2efaa21f 100644
--- a/src/meson.build
+++ b/src/meson.build
@@ -451,20 +451,21 @@ slowcat = executable(
 
 # reflect
 
-reflect_sources = config_sources + files(
-  'reflect.c'
-)
+if get_option('gtk3')
 
-reflect_textview = executable(
-  'reflect-textview',
-  sources: reflect_sources,
-  dependencies: [gtk3_dep],
-  c_args: ['-DUSE_TEXT_VIEW'],
-  include_directories: top_inc,
-  install: false,
-)
+  reflect_sources = config_sources + files(
+    'reflect.c'
+  )
+
+  reflect_textview = executable(
+    'reflect-textview',
+    sources: reflect_sources,
+    dependencies: [gtk3_dep],
+    c_args: ['-DUSE_TEXT_VIEW'],
+    include_directories: top_inc,
+    install: false,
+  )
 
-if get_option('gtk3')
   reflect_vte = executable(
     'reflect-vte',
     sources: reflect_sources,
@@ -476,6 +477,7 @@ if get_option('gtk3')
     include_directories: [top_inc,],
     install: false,
   )
+
 endif
 
 # vte-urlencode-cwd