Warn about outdated csocket submodule

Makefile.in

@@ -148,7 +148,7 @@ endif
 ifneq "THIS_IS_NOT_TARBALL" ""
 # If git commit was changed since previous build, add a phony target to dependencies, forcing version.o to be recompiled
 # Nightlies have pregenerated version.cpp
-src/version.cpp: Makefile version.sh $(shell if [ x`cat .version_extra 2> /dev/null` != x`$(srcdir)/version.sh $(GIT) 2> /dev/null` ]; then echo version_extra_recompile; fi)
+src/version.cpp: Makefile version.sh $(shell if [ x`cat .version_extra 2> /dev/null` != x`$(srcdir)/version.sh $(GIT) 3>&2 2> /dev/null` ]; then echo version_extra_recompile; fi)
 	@mkdir -p .depend src
 	$(E) Building source file version.cpp...
 	$(Q)WRITE_OUTPUT=yes $(srcdir)/version.sh "$(GIT)" > .version_extra 2> /dev/null

version.sh

@@ -1,6 +1,6 @@
 #!/bin/sh
 
-# When changing this file, remember also about nightlies
+# When changing this file, remember also about nightlies (make-tarball.sh)
 
 # Get the path to the source directory
 GIT_DIR=`dirname $0`
@@ -11,6 +11,7 @@ if [ "x$GIT" = "x" ]
 then
 	EXTRA=""
 else
+	GIT_HERE="${GIT}"
 	GIT="${GIT} --git-dir=${GIT_DIR}/.git"
 
 	# Figure out the information we need
@@ -38,6 +39,14 @@ else
 	else
 		EXTRA="-git-${COMMITS_SINCE}-${SHORT_ID}"
 	fi
+
+	if [ 1 = `cd ${GIT_DIR}; ${GIT_HERE} status --ignore-submodules=dirty --porcelain -- third_party/Csocket | wc -l` ]
+	then
+		# Makefile redirects all errors from this script into /dev/null, but this messages actually needs to be shown
+		# So put it to 3, and then Makefile redirects 3 to stderr
+		echo "Warning: Csocket submodule looks outdated. Run: git submodule update --init --recursive" 1>&3
+		EXTRA="${EXTRA}-frankenznc"
+	fi
 fi
 
 # Generate output file, if any