Update ARC specific test to recognize current cpu options

Some tests were failing with compiler option -marc700, because they are ARC
v2 specific, but -marc700 wasn't in the list of options that specify that
test is unsupported.

Signed-off-by: Anton Kolesov <Anton.Kolesov@synopsys.com>
Fix builtin_general.c test case on ARCompact

gcc.target/arc/builtin_general.c has been failing on ARC v1, because
__builtin_arc_seti() was tested unconditionally, but is available only for
ARC v2.

Signed-off-by: Anton Kolesov <Anton.Kolesov@synopsys.com>