GitHub PR 19: remove jemalloc checks

See merge request !61

Signed-off-by: Alessandro-Barbieri <lssndrbarbieri@gmail.com>

If building in a separate directory and using the automake
option --disable-dependency-tracking, which skips some checks,
the directory 'c' may not be created at the start of the recipe.

Using --without-arg was not being respected

Fix errors and warnings when using the new Autoconf 2.70

See merge request !59

* NANOX_CONFIGURE_ARGS was being defined in several lines breaking
    the configure step.
* Remove or replace obsolete macros

Fix clang compilation issues

See merge request !58

Resolve "GCC 10 or new kernel: error: '_sys_siglist' was not declared in this scope"

Closes #1251

See merge request !57

Fix broken tg-dump task IO ranges

GitHub PR 10: tg-dump plugin initial implementation

See merge request !56