*: add -Wunused-parameter; fix resulting breakage

function                                             old     new   delta
procps_scan                                         1265    1298     +33
aliascmd                                             278     283      +5
parse_file_cmd                                       116     120      +4
dname_enc                                            373     377      +4
setcmd                                                90      93      +3
execcmd                                               57      60      +3
count_lines                                           72      74      +2
process_command_subs                                 340     339      -1
test_main                                            409     407      -2
mknod_main                                           179     177      -2
handle_incoming_and_exit                            2653    2651      -2
argstr                                              1312    1310      -2
shiftcmd                                             131     128      -3
exitcmd                                               46      43      -3
dotcmd                                               297     294      -3
breakcmd                                              86      83      -3
evalpipe                                             353     349      -4
evalcommand                                         1180    1176      -4
evalcmd                                              109     105      -4
send_tree                                            374     369      -5
mkfifo_main                                           82      77      -5
evalsubshell                                         152     147      -5
typecmd                                               75      69      -6
letcmd                                                61      55      -6
add_cmd                                             1190    1183      -7
main                                                 891     883      -8
ash_main                                            1415    1407      -8
parse_stream                                        1377    1367     -10
alloc_procps_scan                                     55       -     -55
------------------------------------------------------------------------------
(add/remove: 0/1 grow/shrink: 7/21 up/down: 54/-148)          Total: -94 bytes
   text    data     bss     dec     hex filename
 797195     658    7428  805281   c49a1 busybox_old
 797101     658    7428  805187   c4943 busybox_unstripped

2 files changed, 4 insertions, 2 deletions

diff --git a/findutils/find.c b/findutils/find.c
index 8c0397798..50c790161 100644
--- a/findutils/find.c
+++ b/findutils/find.c
@@ -74,7 +74,9 @@ typedef struct {
 #endif
 } action;
 #define ACTS(name, arg...) typedef struct { action a; arg; } action_##name;
-#define ACTF(name)         static int func_##name(const char *fileName, struct stat *statbuf, action_##name* ap)
+#define ACTF(name)         static int func_##name(const char *fileName ATTRIBUTE_UNUSED, \
+                                                  struct stat *statbuf ATTRIBUTE_UNUSED, \
+                                                  action_##name* ap ATTRIBUTE_UNUSED)
                          ACTS(print)
                          ACTS(name,  const char *pattern; bool iname;)
 USE_FEATURE_FIND_PATH(   ACTS(path,  const char *pattern;))
diff --git a/findutils/grep.c b/findutils/grep.c
index 1094dcc63..c4cfcb852 100644
--- a/findutils/grep.c
+++ b/findutils/grep.c
@@ -371,7 +371,7 @@ static void load_regexes_from_file(llist_t *fopt)
         }
 }
 
-static int file_action_grep(const char *filename, struct stat *statbuf, void* matched, int depth)
+static int file_action_grep(const char *filename, struct stat *statbuf ATTRIBUTE_UNUSED, void* matched, int depth ATTRIBUTE_UNUSED)
 {
         FILE *file = fopen(filename, "r");
         if (file == NULL) {