Fix socklen_t check in acinclude.m4 to work for OpenBSD (at least)
Changelog:
* Fixed some hangs that occured when seeking in MPEG files
* Reworked the looping code - it should work better now
* Fixed memory leak when sound was disabled
* Widened initial search for audio streams in MPEG files
* plaympeg now shows the name of the MPEG file in the caption
* Added a check for the socklen_t type (was broken -pval)
* Fixed crash with incorrectly encoded macroblock sequences
* Fixed a crash when the MPEG file can't be opened
* Fixed crash in gtv when seeking without a file loaded
