[nautilus-ideviceinfo] build: Fix builddir != srcdir

[Bastien Nocera <hadess src gnome org>]

commit 6a9dd28f52798b7a8d5f2031bb8ee261023ba42e
Author: Bastien Nocera <hadess hadess net>
Date:   Tue Feb 13 00:23:16 2018 +0100

    build: Fix builddir != srcdir

 autogen.sh |   11 ++++++++++-
 1 files changed, 10 insertions(+), 1 deletions(-)
---
diff --git a/autogen.sh b/autogen.sh
index cb3887a..c230819 100755
--- a/autogen.sh
+++ b/autogen.sh
@@ -1,10 +1,19 @@
 #!/bin/sh
+
+srcdir=`dirname $0`
+test -z "$srcdir" && srcdir=.
+olddir=`pwd`
+
+cd "$srcdir"
+
 aclocal -I m4
 libtoolize
 autoheader
 automake --add-missing
 autoconf
 
+cd "$olddir"
+
 if [ -z "$NOCONFIGURE" ]; then
-    ./configure "$@"
+    "$srcdir"/configure "$@"
 fi