- Make libcrypto.so position independent on i386.

- Make libcrypto.so position independent on i386.
- Enable linker error when libcrypto.so contains a relocation against text.
- Add "Do not modify" comment to generated source files.
- Set CC environment variable for Perl scripts to enable AVX instructions.
- Update __FreeBSD_version to indicate libcrypto.so is position independent.

Note this is a direct commit because head has OpenSSL 1.0.2 branch but based
on r299389, r299462, r299464, r299479, and r299480.

git-svn-id: svn://svn.freebsd.org/base/stable/10@299966 ccf9f872-aa2e-dd11-9fc8-001c23d0bc1f