buildgcc: Re-add some break statements

While some of the case .. break statement actually weren't needed,
too are, since otherwise the option parsing loop hangs.

Exit conditions for that endless loop: "--" or no more arguments,
in line with GNU command line parsing rules.

Change-Id: I0dbc35e530fb8c93a0f7de05ac47f325555ad4a4
Signed-off-by: Patrick Georgi <patrick@georgi-clan.de>
Reviewed-on: http://review.coreboot.org/3418
Tested-by: build bot (Jenkins)
Reviewed-by: David Hubbard <david.c.hubbard+coreboot@gmail.com>

0 files changed, 0 insertions, 0 deletions