emulators/virtualbox-ose-{,-nox11}-7{0,1,2}: Make Qt optional for building

Remove build dependency for Qt when NLS and graphical frontend is not
required.

PR:		291023
Co-authored-by:	takahiro.kurosawa@gmail.com
MFH:		2025Q4
(cherry picked from commit 4f1b651ebc7aa3fca1b19f4f45fed00e5a397d57)

emulators/virtualbox-ose-additions*: Fix "vboxmanage guestproperty" on host does
not show interface name for FreeBSD guest

Upstream issue:
https://github.com/VirtualBox/virtualbox/issues/403
Upstream commit:
https://github.com/VirtualBox/virtualbox/commit/3cf64726847e2483c9539ca51c88862a0f1c7414

PR:	291128
MFH:	2025Q4
(cherry picked from commit 89de71b8c7759fb3f75fe9d92170e76d94d3e32b)

emulators/virtualbox-ose-70: Fix description in rc script

Fix description for option vboxinit_start_delay.

MFH:	2025Q4
(cherry picked from commit 82e1a6f42218c6d69c37e2fb6e8ce05580ed9c97)

emulators/virtualbox-ose*: Fix vboxvfs build on 16-CURRENT

/wrkdirs/usr/ports/emulators/virtualbox-ose-additions/work/VirtualBox-6.1.50/src/VBox/Additions/freebsd/vboxvfs/vboxvfs_vnops.c:1271:9:
error: use of undeclared identifier 'NULLVP'
 1271 |         *vpp = NULLVP;
      |                ^
/wrkdirs/usr/ports/emulators/virtualbox-ose-additions/work/VirtualBox-6.1.50/src/VBox/Additions/freebsd/vboxvfs/vboxvfs_vnops.c:1281:3:
error: call to undeclared function 'VREF'; ISO C99 and later do not support
implicit function declarations [-Werror,-Wimplicit-function-declaration]
 1281 |                 VREF(dvp);
      |                 ^

Commits that broke the build:
https://cgit.freebsd.org/src/commit/sys/sys/vnode.h?id=7e4c451c12aeb26cc1179221b8230c491b17cf00
https://cgit.freebsd.org/src/commit/sys/sys/vnode.h?id=01c8e2e33df81b242d73a23de49a6b61f33c24c1

PR:		289992
Reported by:	pkg-fallout
MFH:		2025Q4

(cherry picked from commit bf21746ce084a75d0c29b3b342ed4dcc4b07d9a2)

emulators/virtualbox-ose{,-nox11}-70: Add support of TPM device emulation using
sysutils/libtpms (default on)

Fix: "Failed to attach to TPM driver. rc=VERR_PDM_DRIVER_NOT_FOUND"

PR:	289922
MFH:	2025Q4
(cherry picked from commit 3203c4f0a53d3e6f44c575769d519d03653be31b)