* vms_make.com: Provide separate library compiled with C++. Some types on OpenVMS x86_64 (for example, `long') have different sizes depending on whether compiled with either C or C++. In particular, X-Windows applications crash if linked with the C++ version. This patch makes `vms_make.com` create a second version of the FreeType library compiled with C++ if OpenVMS is running on the x86_64 platform.