openssl.inc: fix openssl 0.9.8 builds for x86 targets

openssl.inc: fix openssl 0.9.8 builds for x86 targets
* split do_compile() into do do_configure() and do_compile()
* don't clobber CFLAG by exporting it: edit Configure script to set
  the machine-specific flags, and let the Configure script append
  feature-based flags
* don't use linux-pentium and linux-ppro, they got dropped in openssl 0.9.8,
  use the Debian machine definitions instead