tools: replace wcwidth() with g_unichar_* APIs

The combination of g_unichar_iszerowidth and
g_unichar_iswide is sufficient to replicate the logic
of wcwidth() for libvirt.
Reviewed-by: NPavel Hrdina <phrdina@redhat.com>
Signed-off-by: NDaniel P. Berrangé <berrange@redhat.com>

tests/vshtabletest.c

@@ -19,6 +19,7 @@
 #include <config.h>
 
 #include <locale.h>
+#include <wchar.h>
 #include <wctype.h>
 
 #include "internal.h"

tools/vsh-table.c

@@ -261,7 +261,7 @@ vshTableSafeEncode(const char *s, size_t *width)
             } else {
                 memcpy(buf, p, len);
                 buf += len;
-                *width += wcwidth(wc);
+                *width += g_unichar_iszerowidth(wc) ? 0 : (g_unichar_iswide(wc) ? 2 : 1);
             }
             p += len;
         }