gst-plugins-bad: libmfx: use target definitions detected by Meson
Instead of open-coding the detection of sizes of long and void* types use the values in config.h generated by Meson. Fixes build on targets other than AArch64, ARM, x86 and x86_64 (which are the only platforms currently covered by the size detection copied over from https://github.com/intel/libvpl). Compile-tested and verified on MIPSel, PPC, PPC64 and RISC-V64.
Signed-off-by: Daniel Golle daniel@makrotopia.org