package/procps-ng: add wchar dependency

Since procps-ng was bumped from 3.3.17 to 4.0.4 in commit
d79f40dbbe98983bc657d4c82d46b38b8283351b ("package/procps-ng: security
bump to version 4.0.4"), the build has been failing on !wchar
configurations with:

src/ps/output.c:68:10: fatal error: wctype.h: No such file or directory
   68 | #include <wctype.h>
      |          ^~~~~~~~~~
compilation terminated.

The problematic code has been added by upstream commit
https://gitlab.com/procps-ng/procps/-/commit/605ea4a8f7460920b6de9e432757bd13f80f0dba,
which landed in upstream release v4.0.0.

To solve this, we simply add a BR2_USE_WCHAR dependency, and update
the comment related to this dependency on the only reverse dependency
of procps-ng.

Fixes:

  http://autobuild.buildroot.net/results/afc035e866bec6f2c14f9d52fa74a9c1897706de/

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
Signed-off-by: Julien Olivain <ju.o@free.fr>
(cherry picked from commit f6fe892141cd4c8b6dd934df92eb1fe7d9469e0c)
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/procps-ng/Config.in

@@ -1,7 +1,13 @@
+comment "procps-ng needs a toolchain w/ wchar"
+	depends on BR2_USE_MMU
+	depends on BR2_PACKAGE_BUSYBOX_SHOW_OTHERS
+	depends on !BR2_USE_WCHAR
+
 config BR2_PACKAGE_PROCPS_NG
 	bool "procps-ng"
 	depends on BR2_USE_MMU # fork()
 	depends on BR2_PACKAGE_BUSYBOX_SHOW_OTHERS
+	depends on BR2_USE_WCHAR
 	select BR2_PACKAGE_NCURSES
 	help
 	  Standard informational utilities and process-handling tools.