fwup: fix for ARC toolchain

fwup: fix for ARC toolchain

Building fwup package with ARC toolchain causes internal compiler error.
Adding patch for ARC gcc solves this issue. In the next version of toolchain,
this problem has already been taken into account.

Fixes:
	http://autobuild.buildroot.net/results/a1b/a1bd5084309ced6c2d1b311617e5d9f0c362557a//
	http://autobuild.buildroot.net/results/dd3/dd3000bd99d71383ce82cd6b01b543cd9660130e//

Signed-off-by: Evgeniy Didin <didin@synopsys.com>
Cc: Alexey Brodkin <abrodkin@synopsys.com>
Cc: arc-buildroot@synopsys.com
Cc: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>