Fix bug with safe mode support option in configure

Configure script has multiple options that can affect CPPFLAGS.
But currently they can't be enabled together, the last option
just overrides the CPPFLAGS result, no matter what was the first
option value.
Because of this bug ENABLE_BOOT_FLAG_SAFE_MODE_SUPPORT is not defined
by default as it should be.

Signed-off-by: Konstantin Aladyshev <aladyshev22@gmail.com>
Change-Id: Ib7211d1306a757af256063aae8ed2b721f3d3e41
1 file changed