Clean up include/stdinc.h and librb/include/rb_lib.h amdj/fix-buildsys-headers

- Unconditionally require stdbool.h in IRCd

  We are a C99 project anyway (configure.ac and meson.build both
  require a C99 compiler), so this header will always be present

  This removes the awful hack defining bool, true, and false in
  its absense, which was creating build errors when using meson,
  because meson.build did not set the HAVE_STDBOOL_H macro

- Modernise definition of alloca(3) according to GNU guidance

  This was in both librb and IRCd, while it only needs to be in
  the former

- Fix missing endianness check in librb/meson.build

  IRCd and librb both use the WORDS_BIGENDIAN macro, which was
  only being set by their configure.ac (with the AC_C_BIGENDIAN
  M4 macro)

  Since IRCd's stdinc.h includes librb's rb_lib.h, which then
  includes librb's librb-config.h, which would have the macro
  defined there, we only need to check for it in librb, so we
  can remove the endianness check from IRCd's configure.ac and
  don't need to add it to IRCd's meson.build

- Use __has_attribute to detect whether compiler attributes are
  available

  This is supported by gcc (5+), clang (2.9+), and ICC (17+)

- Add a __noreturn macro for __attribute__((__noreturn__)) and
  adjust the codebase to use that

- Remove inclusion of headers that are only used by librb

- Remove inclusion of headers that are included in rb_lib.h
  because stdinc.h includes rb_lib.h anyway

- Remove the checks for headers and functions from the IRCd
  configure.ac and meson.build that are only used by librb

- Alphabetise checks for headers and functions (by the name of
  the macro they define) in the meson.build files

- Use check_header() instead of has_header() in meson to see if
  it is actually possible to compile code using the header

- Remove dead code using srand48(3) which has never been
  compiled because neither build system has ever set the
  HAVE_SRAND48 macro and the surrounding code makes no use of
  this libc RNG

- Remove the TLS defines from IRCd's meson.build because librb's
  meson.build already defines them and IRCd pulls those in

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