Build failure on Mac OS X

[Robert Lougher]

Hi,

I tried building the lastest distcheck on Mac OS X last night (first
time in a while).  The build trivially failed in two files:

native/jni/java-net/gnu_java_net_VMPlainSocketImpl.c
native/jni/java-nio/gnu_java_nio_VMChannel.c

The type uint32_t is undefined.  This is easily fixed by including <stdint.h>.

Thanks,

Rob.