rdp: allow to compile against FreeRDP 2.0

FreeRDP 2.0 is about to be released, this allows to compile against this version.
The detection is adjusted to prefer FreeRDP 2 against version 1.x.

Signed-off-by: David Fort <contact@hardening-consulting.com>
Reviewed-by: Quentin Glidic <sardemff7+git@sardemff7.net>
Reviewed-by: Bryce Harrington <bryce@osg.samsung.com>
diff --git a/configure.ac b/configure.ac
index c49c632..e1300b4 100644
--- a/configure.ac
+++ b/configure.ac
@@ -238,7 +238,10 @@
                [test x$enable_rdp_compositor = xyes])
 if test x$enable_rdp_compositor = xyes; then
   AC_DEFINE([BUILD_RDP_COMPOSITOR], [1], [Build the RDP compositor])
-  PKG_CHECK_MODULES(RDP_COMPOSITOR, [freerdp >= 1.1.0])
+  PKG_CHECK_MODULES(RDP_COMPOSITOR, [freerdp2 >= 2.0.0],
+    [],
+    [PKG_CHECK_MODULES(RDP_COMPOSITOR, [freerdp >= 1.1.0],[])]
+  )
 
   SAVED_CPPFLAGS="$CPPFLAGS"
   CPPFLAGS="$CPPFLAGS $RDP_COMPOSITOR_CFLAGS"