'lib' is for 32-bit libraries only, thank you very much

--- a/scripts/defs.mak.in
+++ b/scripts/defs.mak.in
@@ -36,7 +36,7 @@
 # Install targets may be different if dist_prefix is set by configure
 INSTALL_BINDIR         = @DIST_DIR@/bin
 INSTALL_MANDIR         = @DIST_DIR@/share/man
-INSTALL_LIBDIR         = @DIST_DIR@/lib
+INSTALL_LIBDIR         = ${libdir}
 INSTALL_SYSDIR         = ${INSTALL_LIBDIR}/magic/sys
 INSTALL_SCMDIR         = ${INSTALL_LIBDIR}/magic/scm
 INSTALL_TCLDIR         = ${INSTALL_LIBDIR}/magic/tcl