Fixed problem with debug build and _sbrk, caused by missing -lc linker
option.

Re-ordered some makefile statements to be in-line with baseflight for
easier merging.
OLIMEXINO - Fix build when LEDs not used.
Fix merge of a753661c23c428ede8c2b72e95d3e31f6c8b894e when building for
targets that use telemetry.
Makefile: add -lc to make debug build with -nostartfiles happy

Signed-off-by: Paul Fertser <fercerpav@gmail.com>