fpu: rename softfloat-specialize.h -> .inc.c

This is not a normal header and should only be included in the main
softfloat.c file to bring in the various target specific
specialisations. Indeed as it contains non-inlined C functions it is
not even a legal header. Rename it to match our included C convention.

Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>

fpu/softfloat.c

@@ -634,7 +634,7 @@ static inline float64 float64_pack_raw(FloatParts p)
 | are propagated from function inputs to output.  These details are target-
 | specific.
 *----------------------------------------------------------------------------*/
-#include "softfloat-specialize.h"
+#include "softfloat-specialize.inc.c"
 
 /* Canonicalize EXP and FRAC, setting CLS.  */
 static FloatParts sf_canonicalize(FloatParts part, const FloatFmt *parm,