[librsvg/darwin-check] configure: properly check for darwin host

[Ignacio Casal Quinteiro <icq src gnome org>]

commit e18436e49f27b7aa06411e58f9761f2dc11654e0
Author: Ignacio Casal Quinteiro <qignacio amazon com>
Date:   Tue Dec 29 15:33:37 2020 +0100

    configure: properly check for darwin host

 configure.ac | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/configure.ac b/configure.ac
index 428b7e73..ceb7cc12 100644
--- a/configure.ac
+++ b/configure.ac
@@ -161,7 +161,7 @@ dnl ===========================================================================
 
 AC_MSG_CHECKING([for darwin])
 case "$host" in
-  darwin*)
+  *-*-darwin*)
     native_darwin=yes
     ;;
   *)