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Fix build on Solaris 11.3.0 - 11.3.8

Alan Coopersmith requested to merge alanc/libxdmcp:s11.3 into master

Solaris 11.3.0 added getentropy() to libc and <sys/random.h>

Solaris 11.3.9 added arc4random() to libc and <stdlib.h>

Solaris 11.4.16 added getentropy() to <stdlib.h>

So when building on Solaris releases from 11.3.0 to 11.3.8, libXdmcp would not find arc4random(), and thus fallback to using getentropy(), but was only looking for it in <stdlib.h>, resulting in a build error:

Key.c: In function ‘arc4random_buf’:
Key.c:86:5: error: implicit declaration of function ‘getentropy’ [-Werror=implicit-function-declaration]
     ret = getentropy (auth, len);


Signed-off-by: Alan Coopersmith

Edited by Alan Coopersmith

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