Merge branch 'bldchn' into next

Merge branch 'bldchn' into next

* bldchn:
  Summary: minor, always pass on SXE_DYLD_PATH with pointers to the lwlibdir Keywords: bldchn
  Summary: minor, call the linker (or the compiler front-end) when ... Keywords: bldchn
  Summary: fix, carefully quote esd lib prepending Keywords: bldchn
  Summary: minor, rewrite linker checks to use the compiler front-end and XFLAG Keywords: bldchn
  Summary: cosmetics, add ar-lib wrapper script to git ignore file Keywords: bldchn
  Summary: fix to cosmetics, add AM_PROG_AR conditionally Keywords: bldchn
  Summary: cosmetics, add AM_PROG_AR like autoreconf suggests Keywords: bldchn
  Summary: minor, check certain compiler flags regardless of CC flavour Keywords: bldchn
  Summary: minor, provide C11 check for anonymous structs Keywords: bldchn
  Summary: fix, use our compiler flag check macros to check for pthread{,s} Keywords: bldchn