TSCH_CONF_ASSOCIATION_POLL_FREQUENCY revert change

msp430: configure according to $(CC)

tests: add more missing cleans

This fixes more non-reproducible failures
in Cooja simulations.

This is a sibling to commit 82af502b.

The checks for how to compile should
be with respect to the compiler used
for the build.

TSCH_CONF_ASSOCIATION_POLL_FREQUENCY: revert the change in CC26xx/CC13xx nodes in version 4.7, restore previous value

tests: exit with legal value

The call to exit needs a natural value
as argument, change -1 to 1.

nrf: fail when missing $(NRFJPROG)

Makefile: add support for ccache

cooja: add $(Q) to the customrules

tests: add missing clean

native: configure according to $(CC)

This fixes a link failure in 02-ringbufindex
because of mismatched object types when running
tests in the 32 bit docker and a 64-bit host
using the same source tree.

Add the make clean for the sky/z1 tests as well
to reduce the risk that future cut&paste based
on existing tests reintroduces this issue.

This reduces the amount of output from
Cooja unless running with V=1.

Add an echo before the final link so
it's possible to diagnose whether the build
step completed when asking for Cooja output
during support requests. Example of error
message from a failing build:

Message:> make test-ringbufindex.cooja TARGET=cooja
Message:  CC        test-ringbufindex.c
...
Message:Redefining printf,sprintf,vsnprintf,etc.
Message:Linking build/cooja/mtype364.cooja
Message:/usr/bin/ld: i386 architecture of input file `build/cooja/mtype364.a(simEnvChange.o)' is incompatible with i386:x86-64 output
...

tests: suppress Nashorn removal warning

After the upgrade to Java 11, the simulation
tests get the warning:

Warning: Nashorn engine is planned to be removed from a future JDK release

Supress the warning since it is an issue with
Cooja and not relevant for the Contiki-NG tests.

The checks for how to compile should
be with respect to the compiler used
for the build.

Replace the echo "ERROR: .." with
a call to $(error) to ensure make
fails with a non-zero return value.

Add Markdown code format to file names

Makefile: allow overriding $(Q)

Fix version detection for recent gcc

Fix some warnings from -Wextra

Updated gcc on Dockerfile to 10.3 2021.10

Fix RPL classic border router prefix

Stop with error when $(CC) is missing

Use hashbang in Python scripts

tests: ensure Cooja is built

tests: ensure cd is successful

tests: stop ignoring the hashbang in scripts

Updated simple-energest to use 64 bit values (same as energest)

Update os/net/security/tinydtls submodule

Execute Python scripts directly so they use
the specified interpreter + parameters
in the first line.

This aligns the behavior between running
Python scripts through make and manually in
the shell.

Use dbg-io for printf, snprintf, etc., in Contiki motes for Cooja

rpl-border-router: fix GCC 8 warnings

Commits:
42356d9 Merge pull request #16 from eraic/master
34f00c4 Merge pull request #30 from pjonsson/align-decl
0c39671 sha2: align prototype and implementation
5384e2b fix arguments in contiki-support

Correct typos in z1 and sky BSL