TCF Agent: removed option -Wmissing-prototypes from Makefile.inc

It causes problems when the agent is build with cross-compiler, e.g.:
cc1plus: error: command line option '-Wmissing-prototypes' is valid for C/ObjC but not for C++
1 file changed
tree: 5656782d0f1b6fbb0dd75c72064fad4c0b969bbe
  1. agent/
  2. examples/
  3. server/
  4. tests/
  5. .gitignore
  6. .mailmap
  7. cmake-tcf-lib.txt