Make callextfunc.c a C++ file; remove -pedantic compiler flag.
Make callextfunc.c a C++ file; remove -pedantic compiler flag.

RTcmix/RTcmix,RTcmix/RTcmix,RTcmix/RTcmix,RTcmix/RTcmix,RTcmix/RTcmix,RTcmix/RTcmix