Makefile: add -lc to make debug build with -nostartfiles happy

Signed-off-by: Paul Fertser <fercerpav@gmail.com>
Merge pull request #142 from paulfertser/master

Makefile: add -lc to make debug build with -nostartfiles happy
Fix more warnings to make it pass -Wextra -Wshadow -Wunsafe-loop-optimizations

Signed-off-by: Paul Fertser <fercerpav@gmail.com>
Merge pull request #143 from paulfertser/master

Fix more warnings to make it pass -Wextra -Wshadow -Wunsafe-loop-optimiz...
Update cli.c

let user set small angle to 180 , let user arm in any orientation , test ok
Merge pull request #144 from treymarc/patch-1

user can arm in any orientation with small angle to 180
Fixed location of const
Merge pull request #145 from ChrisNisbet01/drv_timer_const_fix

Minor 'const' issue.
making it really const this time.
Update imu.c
Update imu.c
Update imu.c
Merge pull request #147 from bubi-007/master

bugfix pt1 element