targets: introduce osCommon.cflags, make -static a common flag on Linux
targets: introduce osCommon.cflags, make -static a common flag on Linux

Signed-off-by: Alexander Potapenko <3640347d2aca22f57be504cddeccc130f1a3ca7e@google.com>

google/syzkaller,xairy/syzkaller,google/syzkaller,google/syzkaller,xairy/syzkaller,xairy/syzkaller,google/syzkaller,xairy/syzkaller,xairy/syzkaller,google/syzkaller,google/syzkaller,xairy/syzkaller,xairy/syzkaller,google/syzkaller