Anonymous unions are GNU and C11 #44
                
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Unrecognized on HP C-ANSI-C
With this change:
HP-UX 11.31/64 U ia64 hp Integrity rx2800 i2/64 Itanium(R) 9320/1361(4) ia64
cc: HP C/aC++ B3910B A.06.28.02 [Mar 09 2016]
All tests successful.
Files=134, Tests=29513, 120 wallclock secs ( 5.77 usr 1.11 sys + 111.76 cusr 6.55 csys = 125.19 CPU)
Result: PASS