cbfstool/lzma: Remove dead code under #ifdefs

Remove a bunch of dead code which depends either on commented out
#defines, or compiler definitions. Use this opportunity to remove the
need for "-D_7ZIP_ST" in the compiler flags.

Change-Id: Ib6629002be7bf4cee6d95d7baa724893b5e8ba32
Signed-off-by: Alexandru Gagniuc <mr.nuke.me@gmail.com>
Reviewed-on: http://review.coreboot.org/5083
Tested-by: build bot (Jenkins)
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
Reviewed-by: Ronald G. Minnich <rminnich@gmail.com>
Reviewed-by: Edward O'Callaghan <eocallaghan@alterapraxis.com>

util/cbfstool/Makefile.inc

@@ -17,7 +17,7 @@ cbfsobj += LzmaEnc.o
 cbfsobj += linux_trampoline.o
 cbfsobj += cbfs-payload-linux.o
 
-CBFSTOOLFLAGS=-D_7ZIP_ST -g
+CBFSTOOLFLAGS= -g
 
 ifeq ($(shell uname -s | cut -c-7 2>/dev/null), MINGW32)
 CBFSTOOLFLAGS+=-mno-ms-bitfields