utils/lstopo: don't build lstopo-win with MSVC

Clang can be used in "MSVC mode" to build hwloc using autotools.
That mode doesn't support -mwindows just like MSVC doesn't.
-mwindows is the only difference between lstopo-win and lstopo,
so just disable lstopo-win instead of building both identically.

Closes #631

Signed-off-by: Brice Goglin <Brice.Goglin@inria.fr>

config/hwloc.m4

@@ -1789,6 +1789,7 @@ AC_DEFUN([HWLOC_DO_AM_CONDITIONALS],[
         AM_CONDITIONAL([HWLOC_BUILD_STANDALONE], [test "$hwloc_mode" = "standalone"])
 
         AM_CONDITIONAL([HWLOC_HAVE_GCC], [test "x$GCC" = "xyes"])
+        AM_CONDITIONAL([HWLOC_HAVE_MSVC], [test "$hwloc_c_vendor" = "microsoft"])
         AM_CONDITIONAL([HWLOC_HAVE_MS_LIB], [test "x$HWLOC_MS_LIB" != "x"])
         AM_CONDITIONAL([HWLOC_HAVE_OPENAT], [test "x$hwloc_have_openat" = "xyes"])
         AM_CONDITIONAL([HWLOC_HAVE_SCHED_SETAFFINITY],

utils/lstopo/Makefile.am

@@ -1,4 +1,4 @@
-# Copyright © 2009-2020 Inria.  All rights reserved.
+# Copyright © 2009-2023 Inria.  All rights reserved.
 # Copyright © 2009-2012, 2014 Université Bordeaux
 # Copyright © 2009-2014 Cisco Systems, Inc.  All rights reserved.
 # Copyright © 2020 Hewlett Packard Enterprise.  All rights reserved.
@@ -60,7 +60,10 @@ lstopo_LDADD += -luser32
 endif
 lstopo_win_SOURCES = $(lstopo_SOURCES)
 lstopo_win_CPPFLAGS = $(lstopo_CPPFLAGS)
-lstopo_win_CFLAGS = $(lstopo_CFLAGS) -mwindows
+lstopo_win_CFLAGS = $(lstopo_CFLAGS)
+if !HWLOC_HAVE_MSVC
+lstopo_win_CFLAGS += -mwindows
+endif
 lstopo_win_LDADD = $(lstopo_LDADD)
 endif