Generate pkg-config for Hammer

Create a pkg-config file and install it to $prefix/lib/pkgconfig

tools/scanreplace.py

@@ -0,0 +1,15 @@
+from string import Template
+
+def replace_action(target, source, env):
+  open(str(target[0]), 'w').write(Template(open(str(source[0]), 'r').read()).safe_substitute(env))
+  return 0
+
+def replace_string(target, source, env):
+  return "building '%s' from '%s'" % (str(target[0]), str(source[0]))
+
+def generate(env, **kw):
+  action = env.Action(replace_action, replace_string)
+  env['BUILDERS']['ScanReplace'] = env.Builder(action=action, src_suffix='.in', single_source=True)
+
+def exists(env):
+  return 1