patch 9.1.0936: cannot highlight completed text

Problem:  cannot highlight completed text
Solution: (optionally) highlight auto-completed text using the
          ComplMatchIns highlight group (glepnir)

closes: #16173

Signed-off-by: glepnir <glephunter@gmail.com>
Signed-off-by: Christian Brabandt <cb@256bit.org>
diff --git a/src/Makefile b/src/Makefile
index f3adaec..b677ebc 100644
--- a/src/Makefile
+++ b/src/Makefile
@@ -359,7 +359,7 @@
 #CONF_OPT_GUI = --enable-gui=motif --with-motif-lib="-static -lXm -shared"
 
 # Uncomment this line to run an individual test with gvim.
-#GUI_TESTARG = GUI_FLAG=-g 
+#GUI_TESTARG = GUI_FLAG=-g
 
 # DARWIN - detecting Mac OS X
 # Uncomment this line when you want to compile a Unix version of Vim on