ports/75890: Port net/tkabber breaks "make index" under 4.8

[Volker Stolz]

In gmane.os.freebsd.devel.ports.bugs, you wrote:
>>Description:
> 4.x make(1) doesn't understand -C before src/usr.bin/make/main.c 1.35.2.9 (RELENG_4_9).
> This causes "make index" in /usr/ports to fail, among other things.
>
>  COMMENT=	Tcl/Tk based jabber client
>  
> -TCLLIBVER!=	${MAKE} -C ${.CURDIR}/../../devel/tcllib -V PORTVERSION
> +TCLLIBVER!=	${MAKE} -C ${.CURDIR}/../../devel/tcllib -V PORTVERSION 2>/dev/null \
> +		|| (cd ${.CURDIR}/../../devel/tcllib; ${MAKE} -V PORTVERSION)

Shouldn't it be sufficient to *always* use the latter construct?

Volker
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