gsl and microsoft-gsl conflict

Both ship identically named files under include/gsl/ as I just found out
by having gsl installed and needing microsoft-gsl.

I don't see an easy way to fix this, so register the conflicts.

Feedback? OK?

Index: devel/gsl/Makefile
===================================================================
RCS file: /cvs/ports/devel/gsl/Makefile,v
retrieving revision 1.39
diff -u -p -r1.39 Makefile
--- devel/gsl/Makefile 11 Mar 2022 18:50:10 -0000 1.39
+++ devel/gsl/Makefile 1 Aug 2022 08:02:17 -0000
@@ -1,7 +1,7 @@
COMMENT= GNU Scientific Library

DISTNAME= gsl-1.15
-REVISION= 3
+REVISION= 4
SHARED_LIBS += gslcblas 1.0 # .0.0
SHARED_LIBS += gsl 12.0 # .16.0

Index: devel/gsl/pkg/PLIST
===================================================================
RCS file: /cvs/ports/devel/gsl/pkg/PLIST,v
retrieving revision 1.11
diff -u -p -r1.11 PLIST
--- devel/gsl/pkg/PLIST 11 Mar 2022 18:50:10 -0000 1.11
+++ devel/gsl/pkg/PLIST 1 Aug 2022 08:02:04 -0000
@@ -1,3 +1,4 @@
+@conflict microsoft-gsl-*
bin/gsl-config
@bin bin/gsl-histogram
@bin bin/gsl-randist
Index: devel/microsoft-gsl/Makefile
===================================================================
RCS file: /cvs/ports/devel/microsoft-gsl/Makefile,v
retrieving revision 1.4
diff -u -p -r1.4 Makefile
--- devel/microsoft-gsl/Makefile 11 Mar 2022 18:50:48 -0000 1.4
+++ devel/microsoft-gsl/Makefile 1 Aug 2022 08:02:27 -0000
@@ -5,7 +5,7 @@ V = 4.0.0
GH_TAGNAME = v${V}
DISTNAME = microsoft-gsl-${V}
CATEGORIES = devel
-REVISION = 0
+REVISION = 1

# MIT
PERMIT_PACKAGE = Yes
Index: devel/microsoft-gsl/pkg/PLIST
===================================================================
RCS file: /cvs/ports/devel/microsoft-gsl/pkg/PLIST,v
retrieving revision 1.3
diff -u -p -r1.3 PLIST
--- devel/microsoft-gsl/pkg/PLIST 10 Mar 2022 12:03:30 -0000 1.3
+++ devel/microsoft-gsl/pkg/PLIST 1 Aug 2022 08:02:02 -0000
@@ -1,3 +1,4 @@
+@conflict gsl-*
include/gsl/
include/gsl/algorithm
include/gsl/assert