Both fusermount.c and mount_util.c use _PATH_MOUNTED, so they should
include <paths.h>, which provides this definition.
This is required for building with the musl C library.
Contributed by Thomas Petazzoni
When starting mount or umount, the environment was not cleared and
could be used for privilege escalation (CVE-2015-3202).
This is a port of the fix to full fuse by using execle(3) instead
of execl(3)
The libfuse used by OpenIndiana has the same features as libfuse-lite
though requiring some code variants. Merging them simplifies supporting
both.
Variants for OpenIndiana are selected when defining __SOLARIS__
