X setup: Add build dependency information

Manaully, because there is no automatic dependency tracking in
setuptools...

Dependency tracking is needed to avoid miscompilation after incremental
update under SlapOS/buildout/testnode/... when e.g. only .h was changed.

setup.py

@@ -265,6 +265,24 @@ def readfile(path):
     with open(path, 'r') as f:
         return f.read()
 
+libvirtmem_h = [
+    '3rdparty/include/linux/list.h',
+    'include/wendelin/bigfile/file.h',
+    'include/wendelin/bigfile/pagemap.h',
+    'include/wendelin/bigfile/ram.h',
+    'include/wendelin/bigfile/types.h',
+    'include/wendelin/bigfile/virtmem.h',
+    'include/wendelin/bug.h',
+    'include/wendelin/list.h',
+    'include/wendelin/utils.h',
+]
+
+libwcfs_h = [
+    'wcfs/client/wcfs.h',
+    'wcfs/client/wcfs_misc.h',
+    'wcfs/client/wcfs_watchlink.h',
+]
+
 setup(
     name        = 'wendelin.core',
     version     = '0.14',   # XXX aka 2.0.0.dev1
@@ -287,6 +305,7 @@ setup(
                      'bigfile/virtmem.c',
                      'lib/bug.c',
                      'lib/utils.c'],
+                    depends = libvirtmem_h,
                     define_macros       = [('_GNU_SOURCE',None), ('BUILDING_LIBVIRTMEM',None)],
                     language = 'c'),
 
@@ -294,11 +313,16 @@ setup(
                     ['wcfs/client/wcfs.cpp',
                      'wcfs/client/wcfs_watchlink.cpp',
                      'wcfs/client/wcfs_misc.cpp'],
+                    depends = libvirtmem_h + libwcfs_h,
                     dsos = ['wendelin.bigfile.libvirtmem'])],
 
     ext_modules = [
                     PyGoExt('wendelin.bigfile._bigfile',
                         ['bigfile/_bigfile.c'],
+                        depends = [
+                         'bigfile/_bigfile.h',
+                         'include/wendelin/compat_py2.h',
+                        ] + libvirtmem_h,
                         define_macros   = [('_GNU_SOURCE',None)],
                         language        = 'c',
                         dsos = ['wendelin.bigfile.libvirtmem']),
@@ -306,10 +330,15 @@ setup(
                     PyGoExt('wendelin.bigfile._file_zodb',
                         ['bigfile/_file_zodb.pyx',
                          'bigfile/file_zodb.cpp'],
+                        depends = [
+                         'wcfs/client/_wcfs.pxd',
+                         'bigfile/_bigfile.h',
+                        ] + libwcfs_h + libvirtmem_h,
                         dsos = ['wendelin.wcfs.client.libwcfs']),
 
                     PyGoExt('wendelin.wcfs.client._wcfs',
                         ['wcfs/client/_wcfs.pyx'],
+                        depends = libwcfs_h + libvirtmem_h,
                         dsos = ['wendelin.wcfs.client.libwcfs']),
 
                     PyGoExt('wendelin.wcfs.internal.wcfs_test',