[valadoc] build: Fix a typo in a variable name in configure.ac

[Philip Withnall <pwithnall src gnome org>]

commit 430979222056bbc0840e02458ac8bce8281d93db
Author: Philip Withnall <philip withnall collabora co uk>
Date:   Thu Nov 7 09:48:24 2013 +0000

    build: Fix a typo in a variable name in configure.ac
    
    https://bugzilla.gnome.org/show_bug.cgi?id=711590

 configure.ac |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/configure.ac b/configure.ac
index a95065a..cfe1d13 100644
--- a/configure.ac
+++ b/configure.ac
@@ -55,7 +55,7 @@ AC_SUBST(LIBGEE_LIBS)
 
 AC_MSG_CHECKING([for CGRAPH])
 valadoc_tmp_LIBADD="$LIBADD"
-valadoc_tmp_CFLAGS="$CFLAGGS"
+valadoc_tmp_CFLAGS="$CFLAGS"
 LIBADD="$LIBADD $LIBGVC_LIBS"
 CFLAGS="$CFLAGS $LIBGVC_CFLAGS"
 AC_RUN_IFELSE(