Martin Storsjö d723ad2774 Use -DPREFIX instead of --prefix _ on OS X
The --prefix parameter differs between yasm and nasm; nasm
requires --prefix _ while yasm requires --prefix=_. Using the
define instead (as on windows) allows easier switching between
the two otherwise mostly compatible assemblers.

This fixes building with yasm on OS X in 32 bit mode. For 64 bit,
a few more tweaks are still required.
2014-03-16 11:59:34 +02:00
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