devel/intel-graphics-compiler: restore BROKEN on i386 but limit to FreeBSD < 13

FAILED: IGC/Release/libigc.so.1.0.1
[...]
LLVM ERROR: out of memory
[...]
#0 0x01c031d4 (/usr/bin/ld+0x1c031d4)
#1 0x01c035de (/usr/bin/ld+0x1c035de)
#2 0x01c0129e (/usr/bin/ld+0x1c0129e)
#3 0x01c03d78 (/usr/bin/ld+0x1c03d78)
#4 0x02c40009 (/usr/bin/ld+0x2c40009)
c++: error: unable to execute command: Abort trap (core dumped)
c++: error: linker command failed due to signal (use -v to see invocation)
ninja: build stopped: subcommand failed.

Reported by: pkg-fallout

This reverts commit eb375ae3a9cc5e0f0b231208df46009eb891fe8d.