Same problem here with 10.3.2. Just updated my ICS components to the latest recommended release (8.61).
I get these errors just trying to compile an empty C++ VCL project with a TSslHttpCli component on it.
[bcc32c Error] sspi.h(65): You must define one of SECURITY_WIN32, SECURITY_KERNEL, or
[bcc32c Error] sspi.h(66): SECURITY_MAC
[bcc32c Error] sspi.h(2288): unknown type name 'PUNICODE_STRING'
I defined 'SECURITY_WIN32' in the project options but now I get this error:
[bcc32c Error] OverbyteIcsSspi.hpp(88): expected ')'
OverbyteIcsSspi.hpp(88): to match this '('
Commented out the SEC_E_INVALID_HANDLE line in the *.hpp files (for 32-bit and 64-bit) and now it compiles and builds (both 32-bit and 64-bit)... still testing though.