package/qemu: add libfuse3 optional dependency

package/qemu: add libfuse3 optional dependency

libfuse3 is an optional dependency which is enabled by default since
version 6.0.0 and
https://gitlab.com/qemu-project/qemu/-/commit/0c9b70d5900a5108e899edfdd6f3790f8cb6bdc2

So add this dependency and fix the following build failures on musl
raised since bump to version 6.0.0 in commit
6b86c9335fc3ff381878156c6243454d4b688df9:

../block/export/fuse.c: In function 'fuse_fallocate':
../block/export/fuse.c:563:23: error: 'FALLOC_FL_ZERO_RANGE' undeclared (first use in this function)
  563 |     } else if (mode & FALLOC_FL_ZERO_RANGE) {
      |                       ^~~~~~~~~~~~~~~~~~~~
../block/export/fuse.c:563:23: note: each undeclared identifier is reported only once for each function it appears in
../block/export/fuse.c: In function 'fuse_lseek':
../block/export/fuse.c:639:19: error: 'SEEK_HOLE' undeclared (first use in this function)
  639 |     if (whence != SEEK_HOLE && whence != SEEK_DATA) {
      |                   ^~~~~~~~~
../block/export/fuse.c:639:42: error: 'SEEK_DATA' undeclared (first use in this function); did you mean 'SEEK_SET'?
  639 |     if (whence != SEEK_HOLE && whence != SEEK_DATA) {
      |                                          ^~~~~~~~~
      |                                          SEEK_SET

Fixes:
 - http://autobuild.buildroot.org/results/0196609043bd37543e6a0d17ffc2254302ea7ba3

Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>