build: Drop deprecrated ACLOCAL_AMFLAGS in favor of AC_CONFIG_MACRO_DIRS

In parallel with tpm2-software/tpm2-tss#2952

Signed-off-by: Christopher Byrne <salah.coronya@gmail.com>

Author: salahcoronya

Makefile.am

@@ -1,7 +1,6 @@
 # SPDX-License-Identifier: BSD-2-Clause
 # we have BUILT_SOURCES so builddir must be in VPATH
 VPATH = $(srcdir) $(builddir)
-ACLOCAL_AMFLAGS = -I m4 --install
 
 .PHONY: unit-count
 

configure.ac

@@ -4,7 +4,7 @@ AC_INIT([tpm2-abrmd],
         [https://github.com/tpm2-software/tpm2-abrmd/issues],
         [],
         [https://github.com/tpm2-software/tpm2-abrmd])
-AC_CONFIG_MACRO_DIR([m4])
+AC_CONFIG_MACRO_DIRS([m4])
 AX_IS_RELEASE(dash-version)
 AX_CHECK_ENABLE_DEBUG([info])
 AC_PROG_CC