[coreboot] [PATCH]libpayload: more libc support

[Patrick Georgi]

Hi,

I updated last week's patch to take Carl-Daniel's review into account.

Attached patch moves functions out of the huge libpayload.h into headers
according to libc/posix traditions, to simplify porting applications to
payloads.

It also adds a couple of functions:
strcasecmp, strncasecmp, strcat, strtol, strspn, strcspn, strtok_r,
strtok, perror, exit, getpagesize

Signed-off-by: Patrick Georgi