uwsgi: add modular package superseeding uwsgi-cgi

Provide the minimal applications and plugins for: cgi, filelog, syslog and
python3. More plugins can be added if needed by other packages. Autostart
uwsgi in emperor mode loading vassals on demand.

For now, include luci-support (maybe it will be moved to another package),
which uses the syslog plugin by default.

Signed-off-by: Peter Stadler <peter.stadler@student.uibk.ac.at>

net/uwsgi/patches/001-dont-hardcode-zlib.patch

@@ -0,0 +1,19 @@
+--- a/uwsgiconfig.py
++++ b/uwsgiconfig.py
+@@ -851,11 +851,11 @@ class uConf(object):
+                 self.cflags.append('-DUWSGI_HAS_EXECINFO')
+                 report['execinfo'] = True
+ 
+-        if self.has_include('zlib.h'):
+-            self.cflags.append('-DUWSGI_ZLIB')
+-            self.libs.append('-lz')
+-            self.gcc_list.append('core/zlib')
+-            report['zlib'] = True
++#        if self.has_include('zlib.h'):
++#            self.cflags.append('-DUWSGI_ZLIB')
++#            self.libs.append('-lz')
++#            self.gcc_list.append('core/zlib')
++            report['zlib'] = False
+ 
+         if uwsgi_os == 'OpenBSD':
+             try: