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Message-ID:	<9e891f88-2c96-ce7b-43c7-752a9e4f1147@yandex.ru>
Date:	Mon, 30 Jan 2023 23:22:44 +0500
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Subject:	[PATCH v2] process: add _dos_exec5()
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Changes in v2:
- Found parameter shadowing by higher
warning levels. So rename flags to flags2
in direct_exec_tail() which uses "flags" as
a local var.

Log msg:

Same as _dos_exec() but with "flags" as 5th arg.
The flags are passed to AL when calling int21/4Bh.
In addition to an execution mode in AL, freedos defines the loadhigh
flag 0x80.

This allows to implement loadhigh properly.
Without this patch it is possible to implement loadhigh by hands
(by linking UMBs in a changing alloc strat), but in that case UMBs
will remain linked in.
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