in python3.8+, to link against python, you need to link against
python3-embed lib, which is supported by a newer meson module.

it builds the libpinyin_parser.so python module.

BUG=https://code.google.com/p/pyzy/issues/detail?id=1
TEST=None

Review URL: https://codereview.appspot.com/6943055

BUG=None
TEST=Manual

Review URL: https://codereview.appspot.com/6307059

BUG=http://code.google.com/p/ibus/issues/detail?id=1441
TEST=Manually

Review URL: https://codereview.appspot.com/6250045

BUG=None
TEST=Manually

Review URL: https://codereview.appspot.com/6201053

replacing
- gchar - char
- gint - int, unsigned int, or size_t
- guint -> unsigned int or size_t
- guint8 -> unsigned char
- gboolean -> bool
- gsize -> size_t
- gpointer -> void *
- gconstpointer -> const void *
- gunichar -> unichar (typedef of int on PyZyUtil.h)

BUG=None
TEST=Run a test

Review URL: http://codereview.appspot.com/5367046

This CL don't modify files under debian/*.
Some files which is removed by http://codereview.appspot.com/5305041/ are also unmodified.

BUG=None
TEST=Manually

Review URL: http://codereview.appspot.com/5301043

BUG=
TEST=

Review URL: http://codereview.appspot.com/5235062