common: First take on handling Unicode command line args.

* common/w32-misc.c: New.
* common/t-w32-cmdline.c: New.
* common/init.c: Include w32help.h.
(prepare_w32_commandline): New.
(_init_common_subsystems) [W32]: Call prepare_w32_commandline.

* common/Makefile.am (common_sources) [W32]: Add w32-misc.c
(module_tests): Add t-w32-cmdline
(t_w32_cmdline_LDADD): New.
--

The rules for the command line parser are not cleary specified - if at
all.  See the comment in t-w32-cmdline.c.

We can't use the mingw version because that would require to change
all argv handling to be wchar_t and that only for Windows.  That would
be too ugly.  Parsing the command line into argv by us is much easier
and we can do that only if needed - i.e. if globing is required (we
are prepared for this) or a non-ASCII character has been encountered.
This way we keep things stable and only fix the currently not working
Unicode problem.

GnuPG-bug-id: 4398
(cherry picked from commit deb6c94362)

common/Makefile.am

@@ -102,7 +102,7 @@ common_sources = \
 
 
 if HAVE_W32_SYSTEM
-common_sources += w32-reg.c
+common_sources += w32-reg.c w32-misc.c
 endif
 
 # To make the code easier to read we have split home some code into
@@ -168,7 +168,7 @@ module_tests = t-stringhelp t-timestuff \
                t-convert t-percent t-gettime t-sysutils t-sexputil \
 	       t-session-env t-openpgp-oid t-ssh-utils \
 	       t-mapstrings t-zb32 t-mbox-util t-iobuf t-strlist \
-	       t-name-value t-ccparray t-recsel
+	       t-name-value t-ccparray t-recsel t-w32-cmdline
 if !HAVE_W32CE_SYSTEM
 module_tests += t-exechelp t-exectool
 endif
@@ -222,6 +222,9 @@ t_name_value_LDADD = $(t_common_ldadd)
 t_ccparray_LDADD = $(t_common_ldadd)
 t_recsel_LDADD = $(t_common_ldadd)
 
+t_w32_cmdline_SOURCES = t-w32-cmdline.c w32-misc.c $(t_extra_src)
+t_w32_cmdline_LDADD = $(t_common_ldadd)
+
 # System specific test
 if HAVE_W32_SYSTEM
 t_w32_reg_SOURCES = t-w32-reg.c $(t_extra_src)