Fix checksum inconsistencies between staged and unstaged bwrap bootstrap

- libtool needs autoconf (& possibly other autotools) at make time, to
  generate correct & reproducible manpages
- musl-1.1.24 shouldn't nuke /usr/include in its src_install(), as it
  will remove headers used by other packages later, notably perl.
  (Also, touching the live filesystem in src_install() will be skipped
  if the package is preseeded instead, causing inconsistency.)

steps/libtool-2.4.7/pass1.sh

@@ -35,7 +35,7 @@ src_configure() {
 }
 
 src_compile() {
-    make "${MAKEJOBS}" AUTOM4TE=autom4te-2.69 MAKEINFO=true
+    make "${MAKEJOBS}" AUTOM4TE=autom4te-2.69 AUTOMAKE=automake-1.15 ACLOCAL=aclocal-1.15 AUTOCONF=autoconf-2.69 AUTOHEADER=autoheader-2.69 MAKEINFO=true
 }
 
 src_install() {