Added start of libarchive bindings for writing

src/libarchive.v

@@ -1,52 +0,0 @@
-// Bindings for the libarchive library
-
-#flag -larchive
-
-#include "archive.h"
-
-struct C.archive {}
-
-// Create a new archive struct
-fn C.archive_read_new() &C.archive
-
-// Configure the archive to work with zstd compression
-fn C.archive_read_support_filter_zstd(&C.archive)
-
-// Configure the archive to work with a tarball content
-fn C.archive_read_support_format_tar(&C.archive)
-
-// Open an archive for reading
-fn C.archive_read_open_filename(&C.archive, &char, int) int
-
-// Go to next entry header in archive
-fn C.archive_read_next_header(&C.archive, &&C.archive_entry) int
-
-// Skip reading the current entry
-fn C.archive_read_data_skip(&C.archive)
-
-// Free an archive
-fn C.archive_read_free(&C.archive) int
-
-// Read an archive entry's contents into a pointer
-fn C.archive_read_data(&C.archive, voidptr, int)
-
-#include "archive_entry.h"
-
-struct C.archive_entry {}
-
-// Create a new archive_entry struct
-fn C.archive_entry_new() &C.archive_entry
-
-// Get the filename of the given entry
-fn C.archive_entry_pathname(&C.archive_entry) &char
-
-// Get an entry's file size
-// Note: this function actually returns an i64, but as this can't be used as an
-// arugment to malloc, we'll just roll with it & assume an entry is never
-// bigger than 4 gigs
-fn C.archive_entry_size(&C.archive_entry) int
-
-#include <string.h>
-
-// Compare two C strings; 0 means they're equal
-fn C.strcmp(&char, &char) int