MFH: r365341

www/chromium: Enable build on FreeBSD < 10 and enable file chooser dialog [1].

- Spell out full path to /sbin/sysctl [2]
- Build with OpenSSL from base to avoid a link conflict on FreeBSD < 10
- Fix build with libusb on FreeBSD < 10 [3]
- Fix build with GCC 4.7 (for 8.4 / 9.1)
- Bump PORTREVISION

PR:		192742 [1]
Submitted by:	cmt@burggraben.net [1]
Submitted by:	J. R. Oldroyd [2]
Submitted by:	db@ [3]

Approved by:	portmgr (erwin)