Fix declaration order in dist_nc_beta_incl_test.cpp test.

Fix long long usage in sf_modf_incl_test.cpp.
Adjust failure rates in test_zeta.cpp to cope with HP aCC and 128-bit long doubles.

[SVN r44351]

libs/math

@@ -1 +1 @@
-Subproject commit 8b89996bd534a2344eb91c71f3df38110f3c372d
+Subproject commit d6071aded4dc0c9a18fd56fa68479abe5de450e2