x86: mpeg4qpel: Make movsxifnidn do the right thing

Fixes an instruction that does nothing by changing the
source to dword.

Signed-off-by: Diego Biurrun <diego@biurrun.de>
build: Make library minor version visible in the Makefile

This allows employing that number in library install commands.
openbsd: Add minor number to shared library install name

This is what the OpenBSD porter's manual describes as correct, cf.
http://www.openbsd.org/faq/ports/specialtopics.html#SharedLibs
doc: developer: Fix wording in "naming conventions" section
doc: developer: Add a note about reserved system name space