[lldb][NFCI] Include <cstdio> in SBDefines for FILE * definition

There are a few API headers that use FILE * but do not include the
correct header for their definition. Instead of including <cstdio> in each
of the headers manually, it seems easiest to include it in SBDefines to
get them all at once.

rdar://109579348

Differential Revision: https://reviews.llvm.org/D151381