[LyX/2.3.x] Make branch compilable in C++98 mode again.

[Pavel Sanda]

commit 69031bb2cea38735dac415e73518266a794b903a
Author: Pavel Sanda <sanda at lyx.org>
Date:   Wed Nov 6 09:53:28 2019 +0100

    Make branch compilable in C++98 mode again.
---
 src/Session.cpp |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/src/Session.cpp b/src/Session.cpp
index 3947883..620333a 100644
--- a/src/Session.cpp
+++ b/src/Session.cpp
@@ -221,7 +221,7 @@ void LastFilePosSection::save(FilePos const & pos)
 {
 	// Remove element if it was already present. Iterating should
 	// not be a problem since the list is small (<100 elements).
-	for (FilePosList::const_iterator it = lastfilepos.begin();
+	for (FilePosList::iterator it = lastfilepos.begin();
 	     it != lastfilepos.end(); ++it)
 		if (it->file == pos.file) {
 			lastfilepos.erase(it);