Fix a ton of compiler warnings

This patch fixes most of current reasons to generate compiler warnings.
The changes consist of:
 - adding missing casts
 - hiding or unhiding function declarations
 - including headers where missing
 - add __UNCONST when assigning a const char * to a char *
 - adding missing return statements
 - changing some types from unsigned to signed, as the code seems to want
   signed ints
 - converting old-style function definitions to current style (i.e.,
   void func(param1, param2) short param1, param2; {...} to
   void func (short param1, short param2) {...})
 - making the compiler silent about signed vs unsigned comparisons. We
   have too many of those in the new libc to fix.

A number of bugs in the test set were fixed. These bugs were never
triggered with our old libc. Consequently, these tests are now forced to
link with the new libc or they will generate errors (in particular tests 43
and 55).

Most changes in NetBSD libc are limited to moving aroudn "#ifndef __minix"
or stuff related to Minix-specific things (code in sys-minix or gen/minix).

lib/libarchive/archive_entry_link_resolver.c

@@ -169,7 +169,9 @@ archive_entry_linkify(struct archive_entry_linkresolver *res,
     struct archive_entry **e, struct archive_entry **f)
 {
 	struct links_entry *le;
+#ifndef __minix
 	struct archive_entry *t;
+#endif
 
 	*f = NULL; /* Default: Don't return a second entry. */
 

lib/libarchive/archive_read_support_format_tar.c

@@ -168,10 +168,10 @@ struct tar {
 	int64_t			 entry_padding;
 	int64_t			 realsize;
 #else
-	size_t			 entry_bytes_remaining;
+	int32_t			 entry_bytes_remaining;
 	off_t			 entry_offset;
 	off_t			 entry_padding;
-	size_t			 realsize;
+	int32_t			 realsize;
 #endif
 	struct sparse_block	*sparse_list;
 	struct sparse_block	*sparse_last;
@@ -538,7 +538,7 @@ archive_read_format_tar_skip(struct archive_read *a)
 #ifndef __minix
 	int64_t bytes_skipped;
 #else
-	size_t	bytes_skipped;
+	int32_t	bytes_skipped;
 #endif
 	struct tar* tar;