Signed-off-by: Brennan Ashton <bashton@brennanashton.com>

C99 is now required.  Therefore HAVE_STDINT_H is no longer necessary.

Christoph Junghans authored 7 years ago and Mathis Rosenhauer committed 7 years ago

Some files, e.g. encode_accessors.c, use loop initial declarations
that are only allowed in C99 mode. Newer compilers enable that mode
automatically, but olders might fail. CMAKE_C_STANDARD got add in
CMake-3.1, so let's increase the minimal version by 0.1.

Signed-off-by: Christoph Junghans <junghans@votca.org>