| Fixes the following build error with GCC 10: | 
 | 	/usr/bin/ld: read_fs.o:(.bss+0x0): multiple definition of `swap'; mksquashfs.o:(.bss+0x1b2a88): first defined here | 
 | And a compile warning. | 
 |  | 
 | --- a/squashfs-tools/read_fs.c | 
 | +++ b/squashfs-tools/read_fs.c | 
 | @@ -61,7 +61,7 @@ extern int add_file(long long, long long | 
 |  						fprintf(stderr, s, ## args); \ | 
 |  					} while(0) | 
 |   | 
 | -int swap; | 
 | +static int swap; | 
 |   | 
 |  int read_block(int fd, long long start, long long *next, unsigned char *block, squashfs_super_block *sBlk) | 
 |  { | 
 | --- a/squashfs-tools/mksquashfs.c | 
 | +++ b/squashfs-tools/mksquashfs.c | 
 | @@ -258,6 +258,7 @@ int read_sort_file(char *filename, int s | 
 |  void sort_files_and_write(struct dir_info *dir); | 
 |  struct file_info *duplicate(char *(get_next_file_block)(struct duplicate_buffer_handle *, unsigned int), struct duplicate_buffer_handle *file_start, long long bytes, unsigned int **block_list, long long *start, int blocks, struct fragment **fragment, char *frag_data, int frag_bytes); | 
 |  struct dir_info *dir_scan1(char *, int (_readdir)(char *, char *, struct dir_info *)); | 
 | +int dir_scan2(squashfs_inode *inode, struct dir_info *dir_info); | 
 |   | 
 |  #define MKINODE(A)	((squashfs_inode)(((squashfs_inode) inode_bytes << 16) + (((char *)A) - data_cache))) | 
 |   |