Bump advertised po4a requirement to 0.41

The po4a --srcdir and --destdir options were introduced in version
0.36.4, but attempts to point --srcdir to a different directory than the
cwd when running po4a produced the message “master file was not found”
instead of doing something useful until version 0.41 (r2317, 2010-11-03).

Signed-off-by: Jonathan Nieder <jrnieder@gmail.com>
Signed-off-by: Guillem Jover <guillem@debian.org>

README

@@ -69,7 +69,7 @@ To enable optional functionality or programs, this software might be needed:
 To enable translated or additional («make doc») documentation this
 software will be needed:
 
-  po4a >= 0.36.4
+  po4a >= 0.36.4 (>= 0.41 for VPATH builds)
   pod2man
   doxygen
   dot

debian/changelog

@@ -27,6 +27,10 @@ dpkg (1.16.2) UNRELEASED; urgency=low
   * Update Dpkg::Shlibs to look into multiarch paths when cross-building
     too. Closes: #595144
 
+  [ Jonathan Nieder ]
+  * Bump po4a version in Build-Depends to 0.41, since earlier versions do
+    not handle --srcdir correctly.
+
   [ Updated dpkg translations ]
   * Italian (Milo Casagrande). Closes: #627832
 

debian/control

@@ -10,7 +10,7 @@ Vcs-Browser: http://git.debian.org/?p=dpkg/dpkg.git
 Vcs-Git: git://git.debian.org/git/dpkg/dpkg.git
 Standards-Version: 3.9.2
 Build-Depends: debhelper (>= 7), pkg-config, flex,
- gettext (>= 0.18), po4a (>= 0.36.4),
+ gettext (>= 0.18), po4a (>= 0.41),
  zlib1g-dev (>= 1:1.1.3-19.1), libbz2-dev,
  libselinux1-dev (>= 1.28-4) [linux-any],
  libncursesw5-dev,