comms/p5-Device-Gsm: fix RUN_DEPENDS

While testing that port i'm greeted with:

> # Failed test 1 in t/01basic.t at line 3
> # t/01basic.t line 3 is: END { ok(0) unless $loaded }
> t/01basic.t .......
> Dubious, test returned 2 (wstat 512, 0x200)
> Failed 2/2 subtests
> Can't locate Device/SerialPort.pm in @INC (you may need to install
> the Device::SerialPort module)

With the below diff, tests pass (but i have no device to really test
it). While here i've removed the useless BUILD_DEPENDS line.

OK ?

Charlène.


Index: Makefile
===================================================================
RCS file: /cvs/ports/comms/p5-Device-Gsm/Makefile,v
retrieving revision 1.14
diff -u -p -u -p -r1.14 Makefile
--- Makefile 3 Jul 2020 21:44:31 -0000 1.14
+++ Makefile 29 Aug 2020 14:19:32 -0000
@@ -4,7 +4,7 @@ COMMENT= Perl extension to interface GSM

DISTNAME = Device-Gsm-1.61
CATEGORIES= comms
-REVISION = 0
+REVISION = 1

MODULES= cpan
PKG_ARCH= *
@@ -12,7 +12,7 @@ PKG_ARCH= *
# Artistic
PERMIT_PACKAGE= Yes

-RUN_DEPENDS= comms/p5-Device-Modem
-BUILD_DEPENDS= comms/p5-Device-Modem
+RUN_DEPENDS= comms/p5-Device-Modem \
+ comms/p5-Device-SerialPort

.include <bsd.port.mk>