Decryption bug fix, static analysis issues, and CTR PRNG reseed bug fix

Decryptions using ccm mode can incorrectly fail
tests: Update return codes and check_result function call
ecc_dh: Fix discrepancy of ecc_make_key definition and declaration
Static analysis issues
Fix warning on incorrect printf type for unsigned int num_bytes
Fix bug in CTR PRNG reseed function to correctly use the seed material
Updates for building on Windows using MinGW-64