[libxslt] Fix 'make dist' on systems without gcrypt

[Nick Wellnhofer <nwellnhof src gnome org>]

commit a85a5ecb3310a6d676dcc11fe8eae8fb65238e55
Author: Nick Wellnhofer <wellnhofer aevum de>
Date:   Mon Feb 14 23:16:53 2022 +0100

    Fix 'make dist' on systems without gcrypt
    
    Set DIST_SUBDIRS and include all subdirectories in
    tests/exslt/Makefile.am.

 tests/exslt/Makefile.am | 1 +
 1 file changed, 1 insertion(+)
---
diff --git a/tests/exslt/Makefile.am b/tests/exslt/Makefile.am
index aeb58c1d..9f20a725 100644
--- a/tests/exslt/Makefile.am
+++ b/tests/exslt/Makefile.am
@@ -1,6 +1,7 @@
 ## Process this file with automake to produce Makefile.in
 
 SUBDIRS=common functions math saxon sets strings dynamic date $(CRYPTO_TESTDIR)
+DIST_SUBDIRS = common functions math saxon sets strings dynamic date crypto
 
 test tests:
        @(cur=`pwd` ; for dir in $(SUBDIRS) ; do cd $$dir ; $(MAKE) CHECKER='$(CHECKER)' tests ; cd $$cur ; 
done)