[master] 72e91d9 Extra care with quoting

[Dridi Boukelmoune]

commit 72e91d9e7a822244e059471e2531bff6db226ffc
Author: Dridi Boukelmoune <dridi.boukelmoune at gmail.com>
Date:   Sat Nov 26 14:29:04 2016 +0100

    Extra care with quoting

diff --git a/varnish.m4 b/varnish.m4
index ec9840b..bb26331 100644
--- a/varnish.m4
+++ b/varnish.m4
@@ -48,7 +48,7 @@ AC_DEFUN([_VARNISH_CHECK_LIB], [
 	save_LIBS="${LIBS}"
 	LIBS=""
 	AC_CHECK_LIB([$1], [$2])
-	AC_SUBST(m4_toupper($1_LIBS), [$LIBS])
+	AC_SUBST(m4_toupper($1_LIBS), "$LIBS")
 	LIBS="${save_LIBS}"
 ])
 
@@ -58,7 +58,7 @@ AC_DEFUN([_VARNISH_SEARCH_LIBS], [
 	save_LIBS="${LIBS}"
 	LIBS=""
 	AC_SEARCH_LIBS([$2], [$3])
-	AC_SUBST(m4_toupper($1_LIBS), [$LIBS])
+	AC_SUBST(m4_toupper($1_LIBS), "$LIBS")
 	LIBS="${save_LIBS}"
 ])