Jerryscript was never using INCLUDES so never having the 'newlib-nano' or llvm
includes. It prevented working with `llvm`.
Disable unsupported warnings for ESP32 and ESP8266 newlib that show when
using system includes.
* tested newlib version for ESP32 is 2.2.0
* tested newlib version for ESP8266 is 3.0.0
Build into the BINDIR directory instead of the source repository.
This makes 'clean' work as expected without other intervention.
Also it goes in the direction of having the package source repository
board independent.
Remove unknown rules from .PHONY.
Make 'all' be the default target for jerryscript and execute `all` target.
This way no definition order issue could happen in the future.
Do not include Makefile.base as 'DIRS' are not used here.
Also if 'all' target was to be used, there would be two rules creating
`$(BINDIR)/jerryscript.a`.
By default `Makefile.jerryscript` executes `libjerry` as it is the first
target.
Without this disabled `nanosleep()` is used, which isn't provided for
most our platforms (though the header `<time.h>` is).
Furthermore, that macro is only used in that instance throughout the
JerryScript codebase.
