THRIFT-2602 fix missing dist files

- add automake 1.13 dependency to configure.ac and doc
- use serial-tests instead of .NOTPARALLEL (introduced by THRIFT-1829)

Patch: Roger Meier
diff --git a/test/cpp/Makefile.am b/test/cpp/Makefile.am
index 3cf31a3..51380ab 100755
--- a/test/cpp/Makefile.am
+++ b/test/cpp/Makefile.am
@@ -16,7 +16,8 @@
 # specific language governing permissions and limitations
 # under the License.
 #
-.NOTPARALLEL:
+AUTOMAKE_OPTIONS = subdir-objects serial-tests
+
 noinst_LTLIBRARIES = libtestgencpp.la libstresstestgencpp.la
 nodist_libtestgencpp_la_SOURCES = \
 	gen-cpp/ThriftTest_constants.cpp \