Unable to install with slibtool

This patch fixes installation when using slibtool (https://dev.midipix.org/cross/slibtool) instead of GNU libtool. The original downstream report is here.

This is a forward of a simple patch from orbea who is unable to sign up to the 2FA requirement.

commit c54898d587fda740b10e32055c5464eeae289889
Author: orbea <orbea@riseup.net>
Date:   Tue Mar 16 10:21:52 2021 -0700

    build: Fix -version-info and -export-symbols-regex typos.

diff --git a/libdca/Makefile.am b/libdca/Makefile.am
index 05bdaca..891fb25 100644
--- a/libdca/Makefile.am
+++ b/libdca/Makefile.am
@@ -5,7 +5,7 @@ lib_LTLIBRARIES = libdca.la
 libdca_la_SOURCES = dca_internal.h tables.h tables_quantization.h \
 		    tables_huffman.h tables_fir.h tables_adpcm.h tables_vq.h \
 		    bitstream.h bitstream.c parse.c downmix.c
-libdca_la_LDFLAGS = -no-undefined -version 0:0:0 -export-symbol-regex dca_.*
+libdca_la_LDFLAGS = -no-undefined -version-info 0:0:0 -export-symbols-regex dca_.*
 libdca_la_LIBADD = $(LIBDCA_LIBS)

 pkgconfigdir = $(libdir)/pkgconfig