Fix warnings

This change fixes Cosmopolitan so it has fewer opinions about compiler
warnings. The whole repository had to be cleaned up to be buildable in
-Werror -Wall mode. This lets us benefit from things like strict const
checking. Some actual bugs might have been caught too.

net/turfwar/blackholed.c

@@ -214,7 +214,7 @@ void GetOpts(int argc, char *argv[]) {
 }
 
 void OnTerm(int sig) {
-  char tmp[15];
+  char tmp[21];
   LOG("got %s", strsignal_r(sig, tmp));
   g_shutdown = sig;
 }
@@ -231,12 +231,12 @@ void BlockIp(uint32_t ip) {
     if (g_iptables) {
       execve(g_iptables,
              (char *const[]){
-                 "iptables",          //
-                 "-t", "raw",         //
-                 "-I", g_chain,       //
-                 "-s", FormatIp(ip),  //
-                 "-j", "DROP",        //
-                 0,                   //
+                 "iptables",             //
+                 "-t", "raw",            //
+                 "-I", (char *)g_chain,  //
+                 "-s", FormatIp(ip),     //
+                 "-j", "DROP",           //
+                 0,                      //
              },
              (char *const[]){0});
     } else if (g_pfctl) {

net/turfwar/turfwar.c

@@ -629,7 +629,7 @@ int GetClaims(struct Claims *q, struct Claim *out, int len) {
 
 // parses request uri query string and extracts ?name=value
 static bool GetNick(char *inbuf, struct HttpMessage *msg, struct Claim *v) {
-  size_t i, n;
+  size_t i;
   struct Url url;
   void *f[2] = {0};
   bool found = false;
@@ -826,7 +826,6 @@ void *HttpWorker(void *arg) {
   // connection loop
   while (GetClient(&g_clients, &client)) {
     struct Data d;
-    struct Url url;
     ssize_t got, sent;
     uint32_t ip, clientip;
     int tok, inmsglen, outmsglen;
@@ -1890,7 +1889,6 @@ void *Supervisor(void *arg) {
 }
 
 void CheckDatabase(void) {
-  int rc;
   sqlite3 *db;
   if (g_integrity) {
     CHECK_SQL(DbOpen("db.sqlite3", &db));