Update libfuse and squashfuse dependencies

[enzo1982]

Update libfuse and squashfuse to their latest releases.

The libfuse update is a prerequisite for #126.

[probonopd]

What is the rationale for the changes besides the version update?

[github-actions]

Build for testing:
artifacts i686
artifacts x86_64
artifacts armhf
artifacts aarch64
Use at your own risk.

[enzo1982]

What is the rationale for the changes besides the version update?

1. Passing -Dexamples=false when building libfuse is because building the memfs_ll example fails in your build environment with:

#11 4.719 ../example/memfs_ll.cc: In function 'void memfs_rename(fuse_req_t, fuse_ino_t, const char*, fuse_ino_t, const char*, unsigned int)':
#11 4.719 ../example/memfs_ll.cc:906:22: error: 'RENAME_EXCHANGE' was not declared in this scope
#11 4.719   906 |         if (flags & (RENAME_EXCHANGE | RENAME_NOREPLACE)) {
#11 4.719       |                      ^~~~~~~~~~~~~~~
#11 4.719 ../example/memfs_ll.cc:906:40: error: 'RENAME_NOREPLACE' was not declared in this scope
#11 4.719   906 |         if (flags & (RENAME_EXCHANGE | RENAME_NOREPLACE)) {
#11 4.719       |                                        ^~~~~~~~~~~~~~~~

• I'm not sure why this happens. It compiles fine on my Ubuntu setup and on FreeBSD 13/14. According to the Linux manpage, including stdio.h and fcntl.h (which memfs_ll.cc does) should be enough to define those constants, but apparently that's not true on Alpine Linux.

2. The previous version used the GitHub auto generated repo snapshot of squashfuse 0.5.2. With the PR I'm switching this to the official release tarball. The repo snapshot does not have a configure script while the release tarball has; thus running autogen.sh is no longer necessary.

3. The mount.c patch is updated to adjust for changes in libfuse's mount.c. No functional changes.