Various fixes to cbfstool.

- add ntohll and htonll (as coreboot parses 64bit fields now)
- use the same byte swapping code across platforms
- detect endianess early
- fix lots of warnings
- Don't override CFLAGS in Makefile

Change-Id: Iaea02ff7a31ab6a95fd47858d0efd9af764a3e5f
Signed-off-by: Stefan Reinauer <reinauer@google.com>
Reviewed-on: http://review.coreboot.org/313
Tested-by: build bot (Jenkins)
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>

util/cbfstool/Makefile

@@ -1,9 +1,10 @@
 obj ?= $(shell pwd)
 
-HOSTCXX ?= g++
-HOSTCC ?= gcc
-CFLAGS ?= -g
-
+HOSTCXX  ?= g++
+HOSTCC   ?= gcc
+CFLAGS   ?= -g -Wall
+CXXFLAGS ?=-DCOMPACT $(CFLAGS)
+LDFLAGS  ?= -g
 
 BINARY:=$(obj)/cbfstool
 
@@ -44,9 +45,5 @@ clean:
 tags:
 	ctags *.[ch]
 
-CXXFLAGS=-DCOMPACT -g
-CFLAGS=-g
-LDFLAGS=-g
-
 $(obj)/cbfstool:$(COMMON)
 	$(HOSTCXX) $(LDFLAGS) -o $@ $^