On Linux, without this patch, linking will fail when an inline function in a Mozilla header file (e.g. security/manager/ssl/src/ScopedNSSTypes.h) tries to call a function declared in a NSS header file, because the #includes within the Mozilla header file end up inheriting our default visibility: hidden. ssltunnel's and PSM's Makefiles work around this by putting $(NSPR_CFLAGS) $(NSS_CFLAGS) in LOCAL_INCLUDES. However, this workaround doesn't really scale for things like ScopedNSSTypes.h, especially when another Mozilla header from another module includes ScopedNSSTypes.h.

Updated patch to remove the media/mtransport changes. The media/mtransport stuff needs a different change that I'm not too sure about, because it doesn't use INCLUDES like the rest of the build system does. Regardless, fixing everything except webrtc is good enough for the immediate need.

Setting the priority fields to make it clear that at least one basecamp blocker depends on this.