package/sp-oops-extract: consolidate use of stdint types

Change u_int*_t to uint*_t for compatibility, as the latter is in C99:

https://stackoverflow.com/questions/5090737/datatypes-used-in-c

Fixes:
http://autobuild.buildroot.net/results/c649822aa129d56e5462a4887b13811340564453/



This patch has also been submitted upstream (ptxdist@pengutronix.de).

Cc: Luca Ceresoli <luca@lucaceresoli.net>
Signed-off-by: Doug Kehn <rdkehn@yahoo.com>
Reviewed-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>