emxomfld: Support wlink (the watcom linker)

[bird]

Since wlink is pretty much the only OMF linker on OS/2 for which we've got source code access, it makes a lot of sense to support it since all the ilink and link386 versions have various "features" which sometimes makes them completely useless.

wlink doesn't (yet) support our debug info format (HLL), adding support for this can be done later.

[bird]

I've done the initial coding, but watch out for bugs. (btw. it's on trunk, not the branch.)

[bird]

I'm getting somewhere with the linker and HLL (v4). Most of the stuff is linked correctly in the helloworld.c example, except for publics which are missing. Publics aren't difficult, just have to adjust and enable the CV code to do HLL. After that I guess the changes should have a critical review, and there are some odd cases (HLL v3 and v6, and older code view) and the fixmes/todos that needs addressing.

[bird]

Fixed the publics.

Now, we've got a problem with exporting weak symbols - i.e. wlink doesn't like exporting alises or something... Will look at it later 'today'.

[bird]

In order to test this properly, I will backport it to 0.6, thought in 0.6 the default linker will still be ilink 5.

[bird]

(In [2815]) Support wlink as an alternative to ilink and link386. backported from the trunk with buildsystem adjustments. see #89.

[bird]

(In [2816]) Support wlink as an alternative to ilink and link386. backported from the trunk with buildsystem adjustments. see #89.

[bird]

The HLL patch part of this defect is separated into #156 so I can close this one for the 0.6.2 release.