pkg/deb: add workaround for cmake <= 2.8.10

PACKAGES are not exported with cmake <= 2.8.10 therefore always create
lib/cmake directory that install doesn't fail

packaging/deb/freerdp-nightly/rules

@@ -44,6 +44,8 @@ override_dh_strip:
 override_dh_install:
 	rm -f debian/tmp/opt/freerdp-nightly/lib/libwinpr-makecert-tool.a
 	rm -f debian/tmp/opt/freerdp-nightly/lib/freerdp/*.a
+	mkdir -p debian/tmp/opt/freerdp-nightly/lib/cmake/
+
 	dh_install --fail-missing
 
 override_dh_clean: