Recreate autoconf.in file from autoconf.as

Fixes: #92

sysa/autoconf-2.55/autoconf-2.55.sh

@@ -3,6 +3,7 @@
 # SPDX-License-Identifier: GPL-3.0-or-later
 
 src_prepare() {
+    rm bin/autoconf.in
     rm Makefile.in */Makefile.in */*/Makefile.in aclocal.m4 configure
 
     autoreconf-2.54
@@ -18,6 +19,10 @@ src_configure() {
 }
 
 src_compile() {
+    # Workaround for racy make dependencies
+    make -C bin autom4te
+    make -C lib
+
     make MAKEINFO=true
 }