• update to 5.59
• remove no longer required post-patch target, shifted into release
• fix options that fail to build
• enable by default options that were unconditionally enabled before the latest change
• option-specific dependencies should only be pulled in when the option is turned on (e.g. change USE_XORG=xinerama to XINERAMA_USE= xorg=xinerama)
• use preferred options helpers (e.g. change MESAGL_CONFIGURE_OFF=--without-opengl --without-ftgl to MESAGL_CONFIGURE_WITH= mesa opengl ftgl
• sort variables according to the 'Order of Variables in Port Makefiles' chapter in the Porter's Handbook
• add missing library dependencies
• add missing tab after =
• ?= -> =

Submitted by: jrm@
Reviewed by: jgh@
Differential Revision: https://reviews.freebsd.org/D21556