package/setools: drop path prefix from man install

For this man file install scenario, joining the sys.prefix makes the
path absolute (this was previously working by accident).  It was
found when e94280e5a5 "package/pkg-python: use proper --prefix
and --root values" was merged.

Fixes:
http://autobuild.buildroot.net/results/e214e1a539cdac07028fb58c3822f89886d86f1f

Upstream:
bc36cba139

Cc: Angelo Compagnucci <angelo.compagnucci@gmail.com>
Cc: Arnout Vandecappelle <arnout@mind.be>
Signed-off-by: Matthew Weber <matthew.weber@rockwellcollins.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>

package/setools/0003-setup.py-drop-path-prefix-from-man-install.patch

@@ -0,0 +1,42 @@
+From bc36cba1393120e65bfe4d0f642fd8d38010c0f7 Mon Sep 17 00:00:00 2001
+From: Matt Weber <matthew.weber@rockwellcollins.com>
+Date: Wed, 28 Nov 2018 20:49:00 -0600
+Subject: [PATCH] setup.py: drop path prefix from man install
+
+If the directory is a relative path, it is interpreted relative to the
+installation prefix (Python's sys.prefix for pure-Python packages,
+sys.exec_prefix for packages that contain extension modules).
+So the sys.prefix should not be joined because the correct one will be
+added regardless. The reason why a relative path is going to work is
+because the installation path is built internally joining python root
+with python prefix, thus forming the correct path $(TARGET_DIR)/usr.
+(https://docs.python.org/3/distutils/setupscript.html#installing-additional-files)
+
+For this man file install scenario, joining the sys.prefix makes the
+path absolute (this was previously working by accident).
+
+Upstream: https://github.com/SELinuxProject/setools/pull/13/commits/bc36cba1393120e65bfe4d0f642fd8d38010c0f7
+
+Cc: Angelo Compagnucci <angelo.compagnucci@gmail.com>
+Cc: Arnout Vandecappelle <arnout@mind.be>
+Signed-off-by: Matthew Weber <matthew.weber@rockwellcollins.com>
+---
+ setup.py | 2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+diff --git a/setup.py b/setup.py
+index 3767fbc..80e0400 100644
+--- a/setup.py
++++ b/setup.py
+@@ -136,7 +136,7 @@ setup(name='setools',
+       cmdclass={'build_qhc': QtHelpCommand, 'clean': CleanCommand},
+       packages=['setools', 'setools.diff', 'setoolsgui', 'setoolsgui.apol'],
+       scripts=['apol', 'sediff', 'seinfo', 'seinfoflow', 'sesearch', 'sedta'],
+-      data_files=[(join(sys.prefix, 'share/man/man1'), glob.glob("man/*.1"))],
++      data_files=[('share/man/man1', glob.glob("man/*.1"))],
+       package_data={'': ['*.ui', '*.qhc', '*.qch'], 'setools': ['perm_map']},
+       ext_modules=cythonize(ext_py_mods, include_path=['setools/policyrep'],
+                             annotate=cython_annotate,
+-- 
+1.9.1
+