patch 8.2.0603: configure does not detect moonjit

Problem:    Configure does not detect moonjit.
Solution:   Add check for moonjit. (Shlomi Fish, closes #5947)

src/auto/configure

@@ -5480,7 +5480,29 @@ $as_echo "yes" >&6; }
 	else
 	  { $as_echo "$as_me:${as_lineno-$LINENO}: result: no" >&5
 $as_echo "no" >&6; }
-	  vi_cv_path_lua_pfx=
+
+	  # Detect moonjit:
+	  # https://groups.google.com/forum/#!topic/vim_use/O0vek60WuTk
+	  lua_suf=/moonjit-2.3
+	  inc_path="$vi_cv_path_lua_pfx/include"
+	  for dir in "$inc_path"/moonjit-0-9* ; do
+	    if test -d "$dir" ; then
+	      lua_suf=`basename '$dir'`
+	      lua_suf="/$lua_suf"
+	      break
+	    fi
+	  done
+	  { $as_echo "$as_me:${as_lineno-$LINENO}: checking if lua.h can be found in $inc_path$lua_suf" >&5
+$as_echo_n "checking if lua.h can be found in $inc_path$lua_suf... " >&6; }
+	  if test -f "$inc_path$lua_suf/lua.h"; then
+	    { $as_echo "$as_me:${as_lineno-$LINENO}: result: yes" >&5
+$as_echo "yes" >&6; }
+	    LUA_INC=$lua_suf
+	  else
+	    { $as_echo "$as_me:${as_lineno-$LINENO}: result: no" >&5
+$as_echo "no" >&6; }
+	    vi_cv_path_lua_pfx=
+	  fi
 	fi
       fi
     fi

src/configure.ac

@@ -625,7 +625,26 @@ if test "$enable_luainterp" = "yes" -o "$enable_luainterp" = "dynamic"; then
 	  LUA_INC=/lua$vi_cv_version_lua
 	else
 	  AC_MSG_RESULT(no)
-	  vi_cv_path_lua_pfx=
+
+	  # Detect moonjit:
+	  # https://groups.google.com/forum/#!topic/vim_use/O0vek60WuTk
+	  lua_suf=/moonjit-2.3
+	  inc_path="$vi_cv_path_lua_pfx/include"
+	  for dir in "$inc_path"/moonjit-[0-9]* ; do
+	    if test -d "$dir" ; then
+	      lua_suf=`basename '$dir'`
+	      lua_suf="/$lua_suf"
+	      break
+	    fi
+	  done
+	  AC_MSG_CHECKING(if lua.h can be found in $inc_path$lua_suf)
+	  if test -f "$inc_path$lua_suf/lua.h"; then
+	    AC_MSG_RESULT(yes)
+	    LUA_INC=$lua_suf
+	  else
+	    AC_MSG_RESULT(no)
+	    vi_cv_path_lua_pfx=
+	  fi
 	fi
       fi
     fi

src/version.c

@@ -746,6 +746,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    603,
 /**/
     602,
 /**/