Tweak and regress-test 'command -x' (re: 66e1d446)

Turns out the assumption I was operating on, that Linux and macOS
align arguments on 32 or 64 bit boundaries, is incorrect -- they
just need some extra bytes per argument. So we can use a bit more
of the arguments buffer on these systems than I thought.

src/cmd/ksh93/features/externs:
- Change the feature test to simply detect the # of extra bytes per
  argument needed. On *BSD and commercial Unices, ARG_EXTRA_BYTES
  shows as zero; on Linux and macOS (64-bit), this yields 8. On
  Linux (32-bit), this yields 4.

src/cmd/ksh93/sh/path.c: path_xargs():
- Do not try to calculate alignment, just add ARG_EXTRA_BYTES to
  each argument.
- Also add this when substracting the length of environment
  variables and leading and trailing static command arguments.

src/cmd/ksh93/tests/path.sh:
- Test command -v/-V with -x.
- Add a robust regression test for command -x.

src/cmd/ksh93/data/builtins.c, src/cmd/ksh93/sh.1:
- Tweak docs. Glob patterns also expand to multiple words.

src/cmd/ksh93/include/version.h

@@ -20,7 +20,7 @@
 
 #define SH_RELEASE_FORK	"93u+m"		/* only change if you develop a new ksh93 fork */
 #define SH_RELEASE_SVER	"1.0.0-alpha"	/* semantic version number: https://semver.org */
-#define SH_RELEASE_DATE	"2021-01-30"	/* must be in this format for $((.sh.version)) */
+#define SH_RELEASE_DATE	"2021-01-31"	/* must be in this format for $((.sh.version)) */
 #define SH_RELEASE_CPYR	"(c) 2020-2021 Contributors to ksh " SH_RELEASE_FORK
 
 /* Scripts sometimes field-split ${.sh.version}, so don't change amount of whitespace. */