added a dumb rule to able to compile tst.c when people submit a sample

* Makefile.am: added a dumb rule to able to compile tst.c
  when people submit a sample test program
* xmlschemas.c: applied small patch from Eric Haszlakiewicz
  to document xmlSchemasSetValidErrors() limitations, #141827
* error.c: Add information in generic and structured error
  setter functions that this need to be done per thread #144308
* xmlsave.c: fixed bug whith missing NOTATION(s) serialization
  bug #144162
* doc/xmllint.xml: typo fix #144840
Daniel
diff --git a/Makefile.am b/Makefile.am
index 995559e..4c73419 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -1000,3 +1000,6 @@
 	-@INSTALL@ -m 0644 $(srcdir)/testSAX.c $(DESTDIR)$(EXAMPLES_DIR)
 	-@INSTALL@ -m 0644 $(srcdir)/testHTML.c $(DESTDIR)$(EXAMPLES_DIR)
 	-@INSTALL@ -m 0644 $(srcdir)/testXPath.c $(DESTDIR)$(EXAMPLES_DIR)
+
+tst: tst.c
+	$(CC) $(CFLAGS) -Iinclude -o tst tst.c .libs/libxml2.a -lpthread -lm -lz