K 10
svn:author
V 5
koobs
K 8
svn:date
V 27
2019-04-21T12:27:01.845054Z
K 7
svn:log
V 568
mail/exim: Fix build (linker) flags

"-export-dynamic" in EXIM_DYNAMIC_LDFLAGS is a linker option, currently
producing a warning during build:

/usr/bin/ld: warning: cannot find entry symbol xport-dynamic; defaulting to 00000000004019c0

The only reason that plugin modules work is that the option is redundant
with -rdynamic.

This change makes the minimum necessary change not relying on linker
argument compatibility (- vs --).

PR:		236426
Submitted by:	<andrew tao11 riddles org uk>
Approved by:	portmgr (maintainer timeout: ~6 weeks, "just fix it")
MFH:		2019Q2

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