wscript. Fix relocation link error (missing -fPIC)

Idea for this fix found in
   http://code.google.com/p/waf/issues/detail?id=800#c1

common/wscript

@@ -106,7 +106,7 @@ def build(bld):
             ]
         includes = ['../macosx', '../macosx/RPC', '../posix'] + includes
 
-    serverlib = bld(features = ['cxx', 'cxxshlib'])
+    serverlib = bld(features = ['c', 'cxx', 'cxxshlib', 'cshlib'])
     serverlib.defines = ['HAVE_CONFIG_H','SERVER_SIDE']
     serverlib.includes = includes
     serverlib.name         = 'serverlib'
@@ -188,7 +188,7 @@ def build(bld):
         serverlib.env.append_value("LINKFLAGS", "-lnsl -lsocket")
 
     if bld.env['BUILD_NETLIB'] == True:
-        netlib = bld(features = ['cxx', 'cxxshlib'])
+        netlib = bld(features = ['c', 'cxx', 'cxxshlib', 'cshlib'])
         netlib.defines = ['HAVE_CONFIG_H','SERVER_SIDE']
         netlib.includes = includes
         netlib.name         = 'netlib'
@@ -221,7 +221,7 @@ def build(bld):
 
         netlib.vnum = bld.env['JACK_API_VERSION']
 
-    clientlib = bld(features = ['cxx', 'cxxshlib'])
+    clientlib = bld(features = ['c', 'cxx', 'cxxshlib', 'cshlib'])
     clientlib.defines = 'HAVE_CONFIG_H'
     clientlib.use = uselib
     clientlib.install_path = '${LIBDIR}'

linux/wscript

@@ -14,7 +14,7 @@ def configure(conf):
     conf.define('HAVE_PPOLL', 1 )
 
 def create_jack_driver_obj(bld, target, sources, uselib = None):
-    driver = bld(features = ['cxx', 'cxxshlib'])
+    driver = bld(features = ['c', 'cxx', 'cxxshlib', 'cshlib'])
     driver.env['cxxshlib_PATTERN'] = 'jack_%s.so'
 
     #driver.defines = ['HAVE_CONFIG_H','SERVER_SIDE', 'HAVE_PPOLL']