RFR: 8230708: Linux-sparc fails to build with gcc-9

[John Paul Adrian Glaubitz]

Hello!

Please review this small change [1] which fixes the build on Linux-sparc
with gcc-9 as the default C/C++ compiler [2].

Cheers,
Adrian

> [1] http://cr.openjdk.java.net/~glaubitz/8230708/webrev.01/
> [2] https://bugs.openjdk.java.net/browse/JDK-8230708

-- 
  .''`.  John Paul Adrian Glaubitz
: :' :  Debian Developer - glaubitz at debian.org
`. `'   Freie Universitaet Berlin - glaubitz at physik.fu-berlin.de
   `-    GPG: 62FF 8A75 84E0 2956 9546  0006 7426 3B37 F5B5 F913