classes/icecc: Disable remote pre-processing by default

classes/icecc: Disable remote pre-processing by default

Unfortunately, GCC has a number of outstanding bugs related to using
-fdirectives-only, which causes a lot of errors when using Icecream.
See:

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=47254
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=88475
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=89658
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91152

Until many of these are addressed, it is better to disable remote
preprocessing.

Signed-off-by: Joshua Watt <JPEWhacker@gmail.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>