monit: Fix build with libtool 2.4.7

Delete old m4 macros, so autoreconf can repopulate it.

Fixes
libtool: Version mismatch error.  This is libtool 2.4.7, but the
libtool: definition of this LT_INIT comes from libtool 2.4.6.
libtool: You should recreate aclocal.m4 with macros from libtool 2.4.7
libtool: and run autoconf again.

Signed-off-by: Khem Raj <raj.khem@gmail.com>

meta-oe/recipes-support/monit/monit_5.31.0.bb

@@ -38,6 +38,10 @@ INITSCRIPT_PACKAGES = "${PN}"
 INITSCRIPT_NAME:${PN} = "monit"
 INITSCRIPT_PARAMS:${PN} = "defaults 89"
 
+do_configure:prepend() {
+    rm -rf ${S}/m4/*
+}
+
 do_install:append() {
 
     # Configuration file