[gtk-doc-stub] Fix handling of --srcdir

[Owen Taylor <otaylor src gnome org>]

commit 25f3d018176622f722d63a1ef62d63f402a03660
Author: Owen W. Taylor <otaylor fishsoup net>
Date:   Sat Aug 27 21:47:13 2016 -0400

    Fix handling of --srcdir
    
    The handling of --srcdir in the last patch a) didn't actually change
    where configure.ac was found b) didn't actualy let the --srcdir argument
    through because it was rejected by later code. Fix both.

 gtkdocize.in |   15 +++++++++++----
 1 files changed, 11 insertions(+), 4 deletions(-)
---
diff --git a/gtkdocize.in b/gtkdocize.in
index 874371c..d74abbc 100644
--- a/gtkdocize.in
+++ b/gtkdocize.in
@@ -43,10 +43,10 @@ test "$docdir" || docdir="$srcdir"
 
 # detect configure script
 no_configure_found=0
-if test -f configure.ac; then
-  configure=configure.ac
-elif test -f configure.in; then
-  configure=configure.in
+if test -f "$srcdir/configure.ac"; then
+  configure="$srcdir/configure.ac"
+elif test -f "$srcdir/configure.in"; then
+  configure="$srcdir/configure.in"
 else
   no_configure_found=1
 fi
@@ -96,6 +96,13 @@ while test $# -gt 0; do
   --flavour=*)
     flavour=`expr "X$1" : '[^=]*=\(.*\)'`
     shift ;;
+  --srcdir)
+    # Handled above
+    shift
+    shift ;;
+  --srcdir=*)
+    # Handled above
+    shift ;;
   -*)
     echo "$progname: unrecognised option '$1'" 1>&2
     echo "$usage" 1>&2