[jhbuild/wip/lantw/fix-warnings-reported-by-shellcheck-again] Fix warnings reported by shellcheck again

[Ting-Wei Lan <lantw src gnome org>]

commit 6675414b800627542d2ce8c2370b02a6d281173b
Author: Ting-Wei Lan <lantw src gnome org>
Date:   Thu Oct 3 23:21:58 2019 +0800

    Fix warnings reported by shellcheck again
    
    It was introduced by commit 14d0fca35038da9ad4b20a62d8baf075f8b12884
    because of missing double quotes.

 autogen.sh | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/autogen.sh b/autogen.sh
index 44042d03..238e8d25 100755
--- a/autogen.sh
+++ b/autogen.sh
@@ -99,7 +99,7 @@ parse_commandline()
     shift
   done
 
-  python="$(basename $python)"
+  python="$(basename "$python")"
 }
 
 # configure JHBuild to build and install without autotools via a plain