Build fails with `../../../dist/out/include/prtypes.h:593:38: error: size of array ‘arg’ is negative`

[Paul Menzel]

Dear LibreOffice,


On ppc64le with Ubuntu 18.04 and latest LibreOffice from master with the
libatomic_ops build fix, the build fails with the error below.

```
$ uname -m
ppc64le
$ git describe --dirty
libreoffice-6-1-branch-point-918-g647d6a2c4fba
$ git log --oneline -1 
647d6a2c4fba (HEAD -> master, origin/master, origin/HEAD) libatomic_ops: Evaluate newer files
$ ./autogen.sh --with-system-libpng --with-boost-system
[…]
$ make
[…]
Makefile:636: warning: overriding recipe for target 'out/Linux_SINGLE_SHLIB'
Makefile:623: warning: ignoring old recipe for target 'out/Linux_SINGLE_SHLIB'
In file included from ../../../dist/out/include/prerror.h:9:0,
                 from drbg.c:9:
drbg.c: In function ‘RNG_RandomUpdate’:
../../../dist/out/include/prtypes.h:593:38: error: size of array ‘arg’ is negative
     extern void pr_static_assert(int arg[(condition) ? 1 : -1])
                                      ^
drbg.c:541:5: note: in expansion of macro ‘PR_STATIC_ASSERT’
     PR_STATIC_ASSERT(sizeof(size_t) <= 4);
     ^~~~~~~~~~~~~~~~
../../coreconf/rules.mk:392: recipe for target 'out/Linux_SINGLE_SHLIB/drbg.o' failed
make[5]: *** [out/Linux_SINGLE_SHLIB/drbg.o] Error 1
[…]
```


Kind regards,

Paul


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