remove obsoleted sal-module-internal custom STL allocator

The SAL module avoided the heavy dependency on the stlport4-libraries by using
a custom allocator for its internal STL containers. With stlport4 removed these
dependencies are gone and the SAL-internal custom allocator is obsoleted.

(cherry picked from commit c6e0325d)

Conflicts:
	include/osl/diagnose.hxx
	include/rtl/allocator.hxx
	sal/osl/w32/procimpl.cxx
	sal/qa/osl/process/osl_process.cxx
	sal/rtl/bootstrap.cxx
	sal/rtl/source/hash.cxx
	sal/rtl/source/unload.cxx

Change-Id: I8515382828eda36aba1fec5f23e0f2a89aef7a33