Added Compaq CXX long long workaround to real_concept.hpp.

Added missing forward declaration to ellint_1.hpp.
Adjusted native log1p support for aCC.
Removed bad forward declaration of fpclassify: correct declaration appears later in the file.
Adjusted compile_test/test_compile_result.hpp to not return a NULL reference.
Adjusted permitted error-limits for new platforms.
Split some of the tests into smaller units so we don't get compiler timeouts when building (hopefully!)

[SVN r39893]

libs/math

@@ -1 +1 @@
-Subproject commit 8342ec648e1968137bb2d61e31717bb8c66545bf
+Subproject commit d4c1bb24c78b66be271832026e4cef6af1778051