Use specific error for missing binary on Windows

Signed-off-by: Nyuchenlin <npes87184@gmail.com>
Signed-off-by: NRomain Vimont <rom@rom1v.com>

app/src/sys/win/command.c

@@ -29,6 +29,9 @@ enum process_result cmd_execute(const char *path, const char *const argv[], HAND
 #endif
     if (!CreateProcess(NULL, cmd, NULL, NULL, FALSE, flags, NULL, NULL, &si, &pi)) {
         *handle = NULL;
+        if (GetLastError() == ERROR_FILE_NOT_FOUND) {
+            return PROCESS_ERROR_MISSING_BINARY;
+        }
         return PROCESS_ERROR_GENERIC;
     }