SDK settings.mk: Don't guess PLATFORM/PROCTYPE

...rather, pass them from the build to the SDK installation via dk.mk.  (The SDK
installation is already platform-specific anyway, see the binary executables in
its bin/ directory, so there is no point in not fixing this at build time.  In
the future, the shipped settings.mk could of course be stripped to just the
parts relevant for a given platform, of course.)

Along the way, fixes some apparent "ppc" vs. "powerpc" typos in settings.mk.

This is a prerequisite to create a working settings.mk for macosx_x86_64, but
does not yet do that.

Change-Id: Ib8e0c03ad6dfd610aae58a61e32bdc61c785584f
Typo in PLATFORMID for Linux powerpc64

cf. the list of platform tokens at <https://wiki.openoffice.org/wiki/
Documentation/DevGuide/Extensions/Target_Platform> and in
desktop/source/deployment/misc/dp_platform.cxx.

Change-Id: Ibfc103bed1f6756654225e2c456ad73ab56c0d5a
Remove unused XInitialization.args data

...now that ModuleUIConfigurationManager no longer implements XInitialization
since 72b5343bd16deec540d8cd148cd7aebd74e92c16 "fwk: Use constructor feature for
ModuleUIConfigurationManager."

Change-Id: I479c6c93e9982d80318e53b794bac99e949a5e46