[Rev 03] RFR: 8241476: Linux build warnings issued on gcc 9

[Ambarish Rapte]

On Mon, 13 Apr 2020 14:47:35 GMT, Kevin Rushforth <kcr at openjdk.org> wrote:

>> Looks good.
>
> @johanvos or @arapte Can one of you be the second reviewer on this?

After this change below c files would be compiled without  `-Werror=implicit-function-declaration` option.
modules/javafx.media/src/main/native/jfxmedia/Utils/ColorConverter.c

modules/javafx.graphics/src/main/native-glass/gtk/wrapped.c
modules/javafx.graphics/src/main/native-glass/gtk/launcher.c

This can be addressed in follow on issue. Recording the files here for track.
Looks good to me.

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PR: https://git.openjdk.java.net/jfx/pull/150