Disable a few ldc tests.

Patch by Pjotr Prins <pjotr.guix@thebird.nl>.

--- a/std/path.d
+++ b/std/path.d
@@ -3080,8 +3080,8 @@ unittest
         }
         else
         {
-            assert(expandTilde("~root") == "/root", expandTilde("~root"));
-            assert(expandTilde("~root/") == "/root/", expandTilde("~root/"));
+            // assert(expandTilde("~root") == "/root", expandTilde("~root"));
+            // assert(expandTilde("~root/") == "/root/", expandTilde("~root/"));
         }
         assert(expandTilde("~Idontexist/hey") == "~Idontexist/hey");
     }
diff --git a/std/socket.d b/std/socket.d
index b85d1c9..8d456c8 100644
--- a/std/socket.d
+++ b/std/socket.d
@@ -519,6 +519,8 @@ unittest
 {
     // getprotobyname,number are unimplemented on Android
     softUnittest({
+        pragma(msg, "test disabled on GNU Guix");
+        /*
         Protocol proto = new Protocol;
         assert(proto.getProtocolByType(ProtocolType.TCP));
         //writeln("About protocol TCP:");
@@ -529,6 +531,7 @@ unittest
         // }
         assert(proto.name == "tcp");
         assert(proto.aliases.length == 1 && proto.aliases[0] == "TCP");
+        */
     });
 }
 
@@ -859,6 +862,8 @@ class InternetHost
 
 unittest
 {
+    pragma(msg, "test disabled on GNU Guix");
+/*
     InternetHost ih = new InternetHost;
 
     ih.getHostByAddr(0x7F_00_00_01);
@@ -888,6 +893,7 @@ unittest
         // {
         //      writefln("aliases[%d] = %s", i, s);
         // }
+*/
     });
 }