More build fixes. Changed the documentation builder to automatically prepend %EPOCROOT% (converted to a path relative form) to pre-processor include path options that start with 'epoc32'. Prevously $(EPOCROOT) was prepended in the makefile, which broke the documentation build because the pre-processor will only accecpt relative path include options.

EXPORTS
	_ZN17RLoggingAllocator7InstallEv @ 1 NONAME
	_ZN17RLoggingAllocator9UninstallEv @ 2 NONAME
	_ZN17RLoggingAllocator15StaticTraceFreeEP10RAllocatorPv @ 3 NONAME
	_ZN17RLoggingAllocator16StaticTraceAllocEP10RAllocatorPvi @ 4 NONAME
	_ZN17RLoggingAllocator7InstallEj @ 5 NONAME
	_ZN17RLoggingAllocator3NewEjP10RAllocatorRPS_ @ 6 NONAME