Druntime changes:

 - Add platform-specific bindings for stdlib.h and sys/syctl.h.

 - Add darwin bindings for mach/dyld.h.

 - Fix solaris bindings for locale.h (PR98910).

 - Remove deprecated bindings from the module headers.

Phobos changes:

 - Backport platform-specific fixes for std.conv, std.datetime,
   std.exception, std.experimental.allocator, std.file, std.math,
   std.parallelism, std.socket, std.stdio, and std.system.

Reviewed-on: https://github.com/dlang/druntime/pull/3363
	     https://github.com/dlang/phobos/pull/7784

libphobos/ChangeLog:

	PR d/98910
	* libdruntime/MERGE: Merge upstream druntime 9d0c8364.
	* libdruntime/Makefile.am (DRUNTIME_DSOURCES): Add
	  core/internal/attributes.d
	(DRUNTIME_DSOURCES_BIONIC): Add core/sys/bionic/stdlib.d.
	(DRUNTIME_DSOURCES_DARWIN): Add core/sys/darwin/stdlib.d, and
	core/sys/darwin/sys/sysctl.d.
	(DRUNTIME_DSOURCES_DRAGONFLYBSD): Add
	core/sys/dragonflybsd/stdlib.d, and
	core/sys/dragonflybsd/sys/sysctl.d.
	(DRUNTIME_DSOURCES_FREEBSD): Add core/sys/freebsd/stdlib.d, and
	core/sys/freebsd/sys/sysctl.d.
	(DRUNTIME_DSOURCES_NETBSD): Add core/sys/netbsd/stdlib.d, and
	core/sys/netbsd/sys/sysctl.d.
	(DRUNTIME_DSOURCES_OPENBSD): Add core/sys/openbsd/stdlib.d, and
	core/sys/openbsd/sys/sysctl.d.
	(DRUNTIME_DSOURCES_SOLARIS): Add core/sys/solaris/stdlib.d.
	* libdruntime/Makefile.in: Regenerate.
	* src/MERGE: Merge upstream phobos 9d575282e.