[SPARC] Fix PR target/87807

[Eric Botcazou]

> unfortunately, the new tests FAIL to compile, both 32 and 64-bit:
> 
> +FAIL: gcc.target/sparc/20181129-1.c (test for excess errors)
> +UNRESOLVED: gcc.target/sparc/20181129-1.c compilation failed to produce
> executable +FAIL: gcc.target/sparc/20181129-2.c (test for excess errors)
> +UNRESOLVED: gcc.target/sparc/20181129-2.c compilation failed to produce
> executable

Not clear how I missed them, they are in my logs too...

> Excess errors:
> /vol/gcc/src/hg/trunk/local/gcc/testsuite/gcc.target/sparc/20181129-1.c:17:3
> : error: ISO C90 forbids mixed declarations and code
> [-Wdeclaration-after-statement]
> 
> /vol/gcc/src/hg/trunk/local/gcc/testsuite/gcc.target/sparc/20181129-2.c: In
> function 'f':
> /vol/gcc/src/hg/trunk/local/gcc/testsuite/gcc.target/sparc/20181129-2.c:17:
> 3: error: ISO C90 forbids mixed declarations and code
> [-Wdeclaration-after-statement]
> 
> The following patch fixes this by building as C99.  Alternatively, it
> would work just as well to split the x declaration and initialization.

Thanks for fixing this.

-- 
Eric Botcazou