• 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.