Function xsltRegisterExtModule 

#[unsafe(no_mangle)]
pub unsafe extern "C" fn xsltRegisterExtModule(
    URI: *const xmlChar,
    initFunc: Option<xsltExtInitFunction>,
    shutdownFunc: Option<xsltExtShutdownFunction>,
) -> c_int

xsltRegisterExtModule (extensions.c): register a module by URI.

UPSTREAM-PARITY

int xsltRegisterExtModule(const xmlChar *URI,
                          xsltExtInitFunction initFunc,
                          xsltExtShutdownFunction shutdownFunc);

Returns 0 on success, -1 on error.