osx: add pycairo wrapper script and rename mapnik one

osx/python/cairo.py

@@ -0,0 +1,17 @@
+import sys
+
+ver_int = int('%s%s' % (sys.version_info[0],sys.version_info[1]))
+ver_str = '%s.%s' % (sys.version_info[0],sys.version_info[1])
+
+path_insert = '/Library/Frameworks/Mapnik.framework/Versions/2.0/unix/lib/python%s/site-packages/'
+
+if ver_int < 26:
+    raise ImportError('Cairo bindings are only available for python versions >= 2.6')
+elif ver_int in (26,27,31):
+    sys.path.insert(0, path_insert % ver_str)
+    from cairo import *
+elif ver_int > 31:
+    raise ImportError('Cairo bindings are only available for python versions <= 3.1')
+else:
+    raise ImportError('Cairo bindings are only available for python versions 2.6, 2.7, and 3.1')
+