gstreamer-plugins-bad 1.14.4 doesn't build on GCC 4.5

The build fails with "redefinition of typedef ..." errors

In the following environment:
gstreamer 1.14.4
custom Linux distro (32-bit)
GCC 4.5.3

This is because duplicated typedefs are not allowed in C99, and GCC 4.5.3 doesn't support C11.