Merge branch '2504-do-not-require-libtool-in-PATH-at-build-time' into 'main'

Do not require libtool in PATH at build time

Closes #2504

See merge request isc-projects/bind9!4715

CHANGES

@@ -1,3 +1,7 @@
+5587.	[bug]		A standalone libtool script no longer needs to be
+			present in PATH in order to build BIND 9 from a source
+			tarball prepared using "make dist". [GL #2504]
+
 5586.	[bug]		An invalid direction field in a LOC record resulted in
 			an INSIST failure. [GL #2499]
 

configure.ac

@@ -107,9 +107,6 @@ AC_PROG_MAKE_SET
 # Checks for programs.
 m4_ifdef([AM_PROG_AR], [AM_PROG_AR]) # call AM_PROG_AR only if available
 
-AC_PATH_PROG([LIBTOOL], [libtool])
-AS_IF([test -z "$LIBTOOL"],
-      [AC_MSG_ERROR([The libtool script could not be found.])])
 AC_PROG_INSTALL
 AC_PROG_LN_S
 AX_POSIX_SHELL