MFH: r457940 r459134

devel/flang: Update to a later development snapshot.

Contains various improvements and fixes over the last two months.

Reported by: Rainer Hurling <rhurlin@gwdg.de>
Reviewed by: swills (mentor)
Approved by: swills (mentor)
Differential Revision: https://reviews.freebsd.org/D13727

devel/flang-clang: Update to a new snapshot and fix pkg-plist to match the recent upgrade of LLVM 5.0.0 to 5.0.1. Update requires patch to remove -ldl.

devel/flang: Bump PORTREVISION to force recompilation after the above companion compiler update.

PR: 225174 (for the LLVM 5.0.1)
Approved by: swills (mentor, implicit)

Approved by: ports-secteam