package/libhttpparser: New package

http-parser provides a simple C API to parse HTTP responses and
requests.

This packaging uses the official Joyent repository.

[Thomas:
 - since we're always building the shared library, depend on
   !BR2_STATIC_LIBS in Config.in. We could build only the static
   library, but then we would have to do all the lib installation
   manually.
 - indent using tabs in Config.in
 - use 'make install' instead of handcoding the library installation.
 - use $(TARGET_CONFIGURE_OPTS) instead of just CC= and LD=.
 - use tabs for indentation in commands instead of spaces
 - add patch to fix reinstallation.]

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>