hg: jdk/sandbox: 8224087: Compile C code for at least C99 Standard compliance

[chris.hegarty at oracle.com]

Changeset: 98ed47cd114a
Author:    dholmes
Date:      2019-05-22 21:50 -0400
URL:       http://hg.openjdk.java.net/jdk/sandbox/rev/98ed47cd114a

8224087: Compile C code for at least C99 Standard compliance
Reviewed-by: simonis, aph, erikj, serb, stuefe

! doc/building.html
! doc/building.md
! make/autoconf/flags-cflags.m4
! make/lib/Awt2dLibraries.gmk