[Ltib] LTIB config not saving TOOLCHAIN_CFLAGS

[Josh Pagnotta]

Hi,

We have modified our LTIB config to use a custom toolchain and now 
whenever we open the LTIB configuration menu (ltib -c), the 
TOOLCHAIN_CFLAGS are empty and we have to enter them in again. When we 
save the config they are there, but when we load it again they are gone, 
making us think the issue is on the loading of the config.

Thanks