Fix warnings in coreboot utilities.

- Fix some poor programming practice (breaks of strict aliasing as well
  as not checking the return value of read)
- Use PRIx64 instead of %llx to prevent compilation warnings with both
  32bit and 64bit compilers
- Use same compiler command options when linking inteltool and when
  detecting libpci for inteltool

Change-Id: I08b2e8d1bbc908f6b1f26d25cb3a4b03d818e124
Signed-off-by: Stefan Reinauer <reinauer@google.com>
Reviewed-on: http://review.coreboot.org/752
Tested-by: build bot (Jenkins)
Reviewed-by: Mathias Krause <minipli@googlemail.com>

util/nvramtool/cli/nvramtool.c

@@ -143,7 +143,11 @@ int main(int argc, char *argv[])
 
 		if (fd_stat.st_size < 128) {
 			lseek(fd, 127, SEEK_SET);
-			write(fd, "\0", 1);
+			if (write(fd, "\0", 1) != 1) {
+				fprintf(stderr, "Unable to extended '%s' to its full size.\n",
+						nvramtool_op_modifiers[NVRAMTOOL_MOD_USE_CMOS_FILE].param);
+				exit(1);
+			}
 			fsync(fd);
 		}