[network-manager-sstp] Remove -DMPPE when compiling the pppd plugin.

[Eivind Næss <eivnaes src gnome org>]

commit c8706313eff99b2348492dcd43a1874d4863875d
Author: Eivind Næss <eivnaes yahoo com>
Date:   Tue Jun 8 14:07:10 2021 -0700

    Remove -DMPPE when compiling the pppd plugin.

 Makefile.am | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/Makefile.am b/Makefile.am
index 08dbdee..23e0b7c 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -117,7 +117,7 @@ src_nm_sstp_pppd_plugin_la_SOURCES = \
        src/nm-ppp-status.h
 src_nm_sstp_pppd_plugin_la_CPPFLAGS = \
     $(src_cppflags) \
-    -DMPPE -DUSE_EAPTLS -DINET6
+    -DUSE_EAPTLS -DINET6
 src_nm_sstp_pppd_plugin_la_LDFLAGS = \
        -module -avoid-version
 src_nm_sstp_pppd_plugin_la_LIBADD = \