patch 8.0.1295: cannot automatically get a server name in a terminal

Problem:    Cannot automatically get a server name in a terminal.
Solution:   Add the --enable-autoservername flag to configure. (Cimbali,
            closes #2317)
diff --git a/src/auto/configure b/src/auto/configure
index 16cbcf3..f4cd8b4 100755
--- a/src/auto/configure
+++ b/src/auto/configure
@@ -817,6 +817,7 @@
 enable_netbeans
 enable_channel
 enable_terminal
+enable_autoservername
 enable_multibyte
 enable_hangulinput
 enable_xim
@@ -1495,6 +1496,7 @@
   --disable-netbeans      Disable NetBeans integration support.
   --disable-channel       Disable process communication support.
   --enable-terminal       Enable terminal emulation support.
+  --enable-autoservername Automatically define servername at vim startup.
   --enable-multibyte      Include multibyte editing support.
   --enable-hangulinput    Include Hangul input support.
   --enable-xim            Include XIM input support.
@@ -7516,6 +7518,22 @@
 
 fi
 
+{ $as_echo "$as_me:${as_lineno-$LINENO}: checking --enable-autoservername argument" >&5
+$as_echo_n "checking --enable-autoservername argument... " >&6; }
+# Check whether --enable-autoservername was given.
+if test "${enable_autoservername+set}" = set; then :
+  enableval=$enable_autoservername;
+else
+  enable_autoservername="no"
+fi
+
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $enable_autoservername" >&5
+$as_echo "$enable_autoservername" >&6; }
+if test "$enable_autoservername" = "yes"; then
+  $as_echo "#define FEAT_AUTOSERVERNAME 1" >>confdefs.h
+
+fi
+
 { $as_echo "$as_me:${as_lineno-$LINENO}: checking --enable-multibyte argument" >&5
 $as_echo_n "checking --enable-multibyte argument... " >&6; }
 # Check whether --enable-multibyte was given.