[flashrom] [PATCH]Build everything on request

[Patrick Georgi]

Hi,

attached patch adds a BUILD_EVERYTHING flag to Makefile
that sets all CONFIG_* flags to "yes" if they were "no".

This provides a comfortable way to ensure maximum code exposure
to tools like coverity[0] or clang's scan-build.

BUILD_EVERYTHING will likely fail on non-Linux/x86 systems,
but it seems that's a hard dependency to compile everything at
this time, so well...

Signed-off-by: Patrick Georgi

Regards,
Patrick

[0] https://scan.coverity.com/projects/1020