Add granularity to PKGSRC_USE_FORTIFY and PKGSRC_USE_RELRO

The new options are, for FORTIFY:
  "no"     Do not pass any flags for FORTIFY
  "weak"   Pass -D_FORTIFY_SOURCE=1
  "strong" Pass -D_FORTIFY_SOURCE=2

This allows users to reduce the level of FORTIFY specified if necessary
or desired. The previous setting as "yes" is now equivalent to "strong"
(the default when enabling).

The new options are, for RELRO:
  "no"      Do not pass any flags for RELRO
  "partial" Pass -Wl,-z,relro
  "full"    Pass -Wl,-z,relro -Wl,-z,now

This allows users to reduce the level of RELRO specified if necessary or
desired. The previous setting as "yes" is now equivalent to "full" (the
default when enabling).

This is intended to match the changes committed by jperkin@ (for SSP)
after our discussion a (long) while back.

No functional change intended (with the settings supported so far).

0 files changed, 0 insertions, 0 deletions