Remove an extraneous backslash

Update acmacros/ax_check_openssl.m4

pbx_ael should not abuse cw_expr() as a syntax checker

Expression evaluation is a two stage process, substitution then
evaluation. Just calling cw_expr() is simply wrong because it isn't
parsing what it would under true evaluation. Worse, you don't want to
expand or evaluate things with possible side effects when simply loading
a dialplan!

Removing this means that some syntax errors will only be detectable at
run-time rather than (possibly) load-time. But that's the nature of the
beast. Dialplan isn't a language. AEL is a text transformation tool that
transforms text into dialplan. AEL is not a language either. IMHO no one
should use AEL and it shouldn't even exist. At the very least it should
exist as a separate "compiler" and not be embedded.

When converting an arg to a number remember it may have an exponent

Initialize the randomlock *after* the mutexattr has been initialized

Use POSIX waitpid() rather than BSD wait4()