(merge from head)

same as for acos.hpp: fixed license reference text; slight changes to comments to avoid spurious inspect tool warnings


[SVN r34712]

libs/math

@@ -1 +1 @@
-Subproject commit 8728ec7e89a18dd93d852548284e6089e81bcceb
+Subproject commit e1467c8da3f6327ac74210dde125c62245ed8d4f