Do not error out with too new autoconf/automake

The tests are not useful, since the configure.ac file checks for
minimal version anyway.

(cherry picked from commit 510b2cfd64)

autogen.sh

@@ -15,16 +15,6 @@ test "$automake_version" != "" && {
     exit 1
 }
 
-case $automake_version in
-    *' '1.1[456]*)
-	;;
-    *)
-	echo "This automake version is not supported by LyX."
-	echo "LyX only supports automake 1.14 through 1.16."
-	exit 1
-	;;
-esac
-
 # Discover what version of autoconf we are using.
 autoversion=`$AUTOCONF --version 2>/dev/null | head -n 1`
 
@@ -35,18 +25,6 @@ test "$autoversion" != "" && {
     exit 1
 }
 
-case $autoversion in
-    *' '2.6[5-9])
-	;;
-    *' '2.71)
-	;;
-    *)
-	echo "This autoconf version is not supported by LyX."
-	echo "LyX only supports autoconf 2.65-2.69, 2.71."
-	exit 1
-	;;
-esac
-
 # Delete old cache directories.
 # automake will stop if their contents was created by an earlier version.
 rm -rf autom4te.cache

status.23x

@@ -103,3 +103,5 @@ What's new
 
 - fix warning when configuring with Qt 5.15.1x.
 
+- do not halt compilation because of a too new autoconf or automake version
+