tools: Check for libtool 2.4

This is required when building libpng.

diff --git a/extras/tools/bootstrap b/extras/tools/bootstrap
index f9e991dc42d90ae8b198e1b8f5caa55653bc3f6f..578d8e6f008f8c3873d7ea89fde41ac03346682d 100755 (executable)
--- a/extras/tools/bootstrap
+++ b/extras/tools/bootstrap
@@ -57,7 +57,7 @@ fi
 check autoconf 2.67
 check automake 1.11
 check m4 1.4.16
-check libtool 2.2
+check libtool 2.4
 check pkg-config
 check cmake
 check yasm