Merge mingwrt-3.22.1 legacy updates to 5.0-active branch.

diff --cc mingwrt/ChangeLog
index 4b712b4,a5caa09..12123cd
--- 1/mingwrt/ChangeLog
--- 2/mingwrt/ChangeLog
+++ b/mingwrt/ChangeLog
@@@ -1,26 -1,40 +1,68 @@@
++2016-08-01  Keith Marshall  <keithmarshall@users.sourceforge.net>
++
++      Merge mingwrt-3.22.1 legacy updates to 5.0-active branch.
++
++      * mingwex/math/powl.c: Update per issue [#2036] workaround.
++      * mingwex/stdio/pformat.c: Likewise, per issue [#2309] resolution,
++      and subsequent 2016-07-24 optimization.
++
+ 2016-07-31  Keith Marshall  <keithmarshall@users.sourceforge.net>
+ 
+       Prepare and tag all files for release of mingwrt-3.22.1.
+ 
+       * configure.ac (AC_INIT): Adjust package version number; append
+       patch level identification.
+ 
+ 2016-07-31  Keith Marshall  <keithmarshall@users.sourceforge.net>
+ 
+       Interim workaround for issue [#2306].
+ 
+       * mingwex/math/powl.c: Tidy layout; correct indentation.
+       (powl, reducl): Use ISO-C declaration syntax; K&R is obsolescent.
+       (powl) [OVERFLOW]: Correct representation of return value, using...
+       (INFINITYL): ...this manifest constant value, instead of...
+       (MAXNUML): ...this.
+ 
+ 2016-07-24  Keith Marshall  <keithmarshall@users.sourceforge.net>
+ 
+       Optimize printf() field width accumulation function.
+ 
+       * mingwex/stdio/pformat.c (__imul10plus): Omit multiply by ten on
+       already accumulated zero total; it is unnecessary, since ten times
+       zero is still zero.
+ 
+ 2016-07-22  Keith Marshall  <keithmarshall@users.sourceforge.net>
+ 
+       Fix printf() field width parsing regression issue [#2309].
+ 
+       * mingwex/stdio/pformat.c (__imul10plus): Coerce any accumulated
+       negative total to zero; the only negative value to be handled is...
+       (PFORMAT_IGNORE): ...this; it ceases to be applicable, on first call
+       to __imul10plus(), to accumulate field width or precision.
+ 
 +2016-07-19  Keith Marshall  <keithmarshall@users.sourceforge.net>
 +
 +      Update install-sh to match mingw.org/build-aux package.
 +
 +      * install-sh: Delete it; use version in parent directory instead,
 +      recreating local copy, (as symlink, if supported), on demand.
 +
 +2016-07-17  Keith Marshall  <keithmarshall@users.sourceforge.net>
 +
 +      Eliminate redundant configuration files.
 +
 +      * aclocal.m4 VERSION.m4: Delete them; restore them on demand, via...
 +      * Makefile.in ($top_srcdir/../%): ...this symlink dependency rule.
 +
 +      * configure.ac (AC_PROG_LN_S): Add configuration check.
 +
 +2016-07-17  Keith Marshall  <keithmarshall@users.sourceforge.net>
 +
 +      Merge mingwrt-3.22 packaging correction to 5.0-active branch.
 +
  2016-07-17  Keith Marshall  <keithmarshall@users.sourceforge.net>
  
 -      Correct source package omission of msvcrt-xref subdirectory.
 +      Correct mingwrt-3.22 source package subdirectory omission.
  
        * Makefile.in (mingwrt-srcdist-files): Add msvcrt-xref.