[LinuxBIOS] [PATCH] use strncmp in lar

[Alex Beregszaszi]

Hi,

attached patch adds:

1, simple strncmp implementation in include/string.h
2, changes lib/lar.c to use strncmp for magic check. Current code
depends on that the len field will never hold a value bigger than
0xffffff, which is a working assumption given current flash sizes, but
my next patch might affect this.