We need to add MSG_NOSIGNAL to FB_SEND_FLAGS for ARM, too, otherwise
clients get killed with SIGPIPE when server connection breaks, just like
commit 37bcd38740 did for other platforms.
Use this opportunity to also split out common build flags to COMMON_FLAGS
variable, as the above commit did.
Signed-off-by: Maciej S. Szmigiero <mail@maciej.szmigiero.name>
2. Cleaned up most of platform-specific additions - most opf them are not needed any more,
still causing troubles when porting. It will be better to re-add that which are really needed.
3. Do not build gds_drop utility on platforms where not needed.
