Fix warnings trivial warnings.

Fix warnings about:
 . Unused variables
 . format mismatch in printf/scanf format string and arguments
 . Missing parenthesis around assignment as truth values
 . Clang warnings anout unknown GCC pragma

lib/libc/gen/minix/times.c

@@ -8,8 +8,7 @@
 __weak_alias(times, _times)
 #endif
 
-clock_t times(buf)
-struct tms *buf;
+clock_t times(struct tms *buf)
 {
   message m;
 

lib/libc/gen/minix/uname.c

@@ -20,8 +20,7 @@ __weak_alias(uname, _uname)
 		return -1; \
 	name->string[sizeof(name->string)-1]= 0;
 
-int uname(name)
-struct utsname *name;
+int uname(struct utsname *name)
 {
 	int hf, n, err;
 	char *nl;

lib/libc/gen/minix/wait.c

@@ -8,8 +8,7 @@
 __weak_alias(wait, _wait)
 #endif
 
-pid_t wait(status)
-int * status;
+pid_t wait(int * status)
 {
   message m;
 

lib/libc/gen/minix/waitpid.c

@@ -8,10 +8,7 @@
 __weak_alias(waitpid, _waitpid)
 #endif
 
-pid_t waitpid(pid, status, options)
-pid_t pid;
-int *status;
-int options;
+pid_t waitpid(pid_t pid, int *status, int options)
 {
   message m;
 

lib/libpuffs/puffs.c

@@ -82,6 +82,7 @@ EXTERN char **env_argv;
 #define PUFFS_MAX_ARGS 20
 
 int __real_main(int argc, char* argv[]);
+int __wrap_main(int argc, char* argv[]);
 
 int __wrap_main(int argc, char *argv[])
 {

lib/librmt/rmtlib.c

@@ -626,12 +626,13 @@ remdev(const char *path)
 int
 rmtopen(const char *path, int oflag, ...)
 {
-	mode_t mode;
+	/* LSC: MINIX  This works only for int mode flags, so use the expected type. */	
+	uint32_t mode;
 	int fd;
 	va_list ap;
 	va_start(ap, oflag);
 
-	mode = va_arg(ap, mode_t);
+	mode = va_arg(ap, uint32_t);
 	va_end(ap);
 
 	_DIAGASSERT(path != NULL);