Use correct OpenSSL libraries for FreeBSD

[jasonpugsley]

src/libraries/Native/Unix/System.Security.Cryptography.Native/opensslshim.c

OpenLibrary() doesn't currently find the correct libraries on my FreeBSD 11.3 build box.

The version of OpenSSL included in the base 11.3 install is 1.0.2

[jason@freebsd11 ~/src/runtime]$ /usr/bin/openssl version
OpenSSL 1.0.2s-freebsd  28 May 2019
[jason@freebsd11 ~/src/runtime]$ ldd /usr/bin/openssl
/usr/bin/openssl:
	libssl.so.8 => /usr/lib/libssl.so.8 (0x8008a4000)
	libcrypto.so.8 => /lib/libcrypto.so.8 (0x800c00000)
	libc.so.7 => /lib/libc.so.7 (0x801076000)

OpenSSL 1.1.1 can be installed with the FreeBSD package manager

[jason@freebsd11 ~/src/runtime]$ /usr/local/bin/openssl version
OpenSSL 1.1.1f  31 Mar 2020
[jason@freebsd11 ~/src/runtime]$ ldd /usr/local/bin/openssl
/usr/local/bin/openssl:
	libssl.so.11 => /usr/local/lib/libssl.so.11 (0x8008b7000)
	libcrypto.so.11 => /usr/local/lib/libcrypto.so.11 (0x800c00000)
	libthr.so.3 => /lib/libthr.so.3 (0x8010ef000)
	libc.so.7 => /lib/libc.so.7 (0x801317000)

OpenLibrary() needs to look for libssl.so.11 and libssl.so.8 to support these versions.

@wfurt

[ghost]

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[jasonpugsley]

What follows is correct to the best of my knowledge. Corrections or updates are welcome.

FreeBSD library version numbering does not directly align to the version of OpenSSL.

Following are the likely library versions to be found on FreeBSD at install-time (Base) and from Ports at this date. Note, FreeBSD 13.0 is still in development.

FreeBSD Version	Base Version	Ports Version
11.3	libssl.so.8	libssl.so.11
12.1	libssl.so.111	libssl.so.11
13.0	libssl.so.111	libssl.so.11

The version of OpenSSL from Ports will be the same or newer than the version included in the base installation, the preferred search order when attempting to load the library is thus:
libssl.so.11 -> libssl.so.111 -> libssl.so.8