Cross compilation broken on OSX: wrong archiver flags

[flxo]

As already mentioned in #176 it is not possible to overwrite the archiver flags. The patch for fixing #176 statically decides about the archiver flags based on the host. The following scenario is broken:

• Host OSX
• (Cross) Toolchain with a ar as archiver

bake will pick the libtool flags because of the host type. This doesn't work if the archiver command is set to some ar variant (common case for cross compilation).

[aschaal]

Yes, you are right. I will add an option to overwrite these flags.

[flxo]

Thanks @aschaal. Ping me for real world test before a release.

[aschaal]

After talking to flxo this fix is not urgently needed, to it will be shifted.
Internal starndard flags will be removed in bake3, which should fix this automatically.