Account for Qt 5.10

Fix regular sed expression in order to catch a second digit in the
Qt minor version number.

(cherry picked from commit 6253cc4c51)

config/qt4.m4

@@ -211,7 +211,7 @@ AC_DEFUN([QT_DO_IT_ALL],
 	QT_FIND_TOOL([QT_RCC], [rcc])
 
 	dnl Safety check
-	mocqtver=`$QT_MOC -v 2>&1 | sed -e 's/.*\([[0-9]]\.[[0-9]]\.[[0-9]]\).*/\1/'`
+	mocqtver=`$QT_MOC -v 2>&1 | sed -e 's/.*\([[0-9]]\.[[0-9]]*\.[[0-9]]\).*/\1/'`
 	if test "x$mocqtver" != "x$QTLIB_VERSION"; then
 		LYX_WARNING([The found moc compiler is for Qt $mocqtver but the Qt library version is $QTLIB_VERSION.])
 	fi

status.23x

@@ -95,6 +95,8 @@ What's new
 - Support new hunspell C++ ABI if LyX is built against hunspell >= 1.5
   (bug 10547).
 
+- Fix spurious warning when compiling with Qt 5.10.
+
 
 
 ** Bug fixes: