E is usually defined as a shorthand for AV_OPT_FLAG_ENCODING_PARAM.
Rename the single expansion E(x) now used in libavutil to E1.

This is what the OpenBSD porter's manual describes as correct, cf.
http://www.openbsd.org/faq/ports/specialtopics.html#SharedLibs

This allows employing that number in library install commands.

Fixes an instruction that does nothing by changing the
source to dword.
Signed-off-by: Diego Biurrun <diego@biurrun.de>

This fixes slice threading which seems to have been broken since
79dad2a9.
Signed-off-by: Martin Storsjö <martin@martin.st>