Patch setup.py so that the detect_modules() function looks for required
libraries and headers in STAGING_LIBDIR / STAGING_INCDIR.

Without this patch, several extension modules are not built, even though
their dependencies are present in the compiler's search paths.
The result is the following warning, and ultimately incomplete packages:

| The necessary bits to build these optional modules were not found:
| _bz2                  _curses_panel         _dbm
| _gdbm                 _lzma                 _sqlite3
| nis                   readline              zlib
| To find the necessary bits, look in setup.py in detect_modules() for the module's name.

Upstream-Status:  Inappropriate [Cross compile specific]

Signed-off-by: Dominic Sacré <dominic.sacre@gmx.de>

Index: Python-3.4.3/setup.py
===================================================================
--- Python-3.4.3.orig/setup.py
+++ Python-3.4.3/setup.py
@@ -521,6 +521,8 @@ class PyBuildExt(build_ext):
         else:
             lib_dirs = self.compiler.library_dirs[:]
             inc_dirs = self.compiler.include_dirs[:]
+            lib_dirs.append(os.environ.get('STAGING_LIBDIR'))
+            inc_dirs.append(os.environ.get('STAGING_INCDIR'))
         exts = []
         missing = []