trees: unset CROSS_COMPILE per target

When building a coreboot image, if they enable the
x86 U-Boot payloads, sometimes what happens is you
have CROSS_COMPILE set, for i386-elf, but then it's
still set to that when later building 64-bit U-Boot,
which needs x86_64-elf.

We currently rely on hostcc to build U-Boot.

To mitigate this, unset CROSS_COMPILE in the main
loop of the trees script, for building project targets.

Signed-off-by: Leah Rowe <leah@libreboot.org>

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