Use system's intltool.

Fixes build failure: https://bugs.gentoo.org/show_bug.cgi?id=425604
(automake fails to regenerate missing files)

Patches by Kvicadlo.
diff --git a/configure.ac b/configure.ac
index d127fad..b9005c5 100644
--- a/configure.ac
+++ b/configure.ac
@@ -549,9 +549,6 @@ doc/changelog.Debian
 doc/vmware-view.1
 doc/vmware-view-tunnel.1
 fix-toolchain-paths.sh
-intltool-update
-intltool-merge
-intltool-extract
 po/Makefile.in
 vmware-view.desktop.in
 ])
diff --git a/Makefile.inc b/Makefile.inc
index 41dfe8f..c440f01 100644
--- a/Makefile.inc
+++ b/Makefile.inc
@@ -243,10 +243,6 @@ testUrl_LDADD += $(GLIB_LIBS)
 testUrl_LDADD += $(ICU_LIBS)
 testUrl_LDADD += $(TUNNEL_FRAMEWORKS)

-dist_noinst_DATA += intltool-extract.in
-dist_noinst_DATA += intltool-merge.in
-dist_noinst_DATA += intltool-update.in
-
 desktop_in_files += vmware-view.desktop.in

 dist_noinst_DATA += INSTALL