This is to avoid outputting something like "\"%\f" instead of [34,37,12] in the XML.

A io_request in eunit reuturns wrong value when it receive getopts or
get_geometry request.

This makes typos such as missing commas between two assertions
(e.g. ?assert(true) ?assert(true)) syntax errors instead of silently
compiling and failing with a badfun error at runtime.

This won't break any existing code as parenthesed expressions and blocks
have the same precedence and none of these macros can be used as patterns.

* nox/enable-silent-rules/OTP-10726:
  Implement ./otp_build configure --enable-silent-rules

With silent rules, the output of make is less verbose and compilation
warnings are easier to spot. Silent rules are disabled by default and
can be disabled or enabled at will by make V=0 and make V=1.