Fix include for EMCC build
#include <brotli/port.h>
#include <brotli/types.h>
-#if defined(OS_LINUX) || defined(OS_CYGWIN)
+#if defined(OS_LINUX) || defined(OS_CYGWIN) || defined(__EMSCRIPTEN__)
#include <endian.h>
#elif defined(OS_FREEBSD)
#include <machine/endian.h>
