* support/cpp2/sdcc.h: removed x*alloc() macros

* support/cpp2/sdcc.h: removed x*alloc() macros
* support/cpp2/libiberty.h: uncommented out x*alloc() declarations
* support/cpp2/Makefile.bcc, support/cpp2/Makefile.in,
  support/cpp2/sdcpp.sdc: x*alloc files added to the project
* support/cpp2/system.h: moved #include "sdcc.h"
* support/cpp2/libiberty/xexit.c, support/cpp2/libiberty/xmalloc.c,
  support/cpp2/libiberty/xstrdup.c, support/cpp2/libiberty/xstrerror.c:
  added
* support/cpp2/sdcppinit.c: added -isysroot, -fsigned-char,
  -funsigned-char options
* support/cpp2/sdcppmain.c: fixed bug 1611411

git-svn-id: https://sdcc.svn.sourceforge.net/svnroot/sdcc/trunk/sdcc@4505 4a8a32a2-be11-0410-ad9d-d568d2c75423