Fix detection of deprecated Bessel function names on MSVC.

- MSVC deprecated the standard POSIX names for Bessel functions in
  favour of underscore prefixed versions.
- Previously we were checking for the presence of the newer underscore
  functions via a macro, which fails as the functions are not defined
  as macros.
- Now we check via a check_cxx_source_compiles() if the newer underscore
  prefixed versions exist when compiling on MSVC and use a new Ceres
  configuration #define to switch on their presence in jet.h

Change-Id: I430880bde2981d12f4d03dbc94d903b9842e887e