[PPC] Fix bootstrap for non-SVR4 targets.

The recent change to move code into the new rs6000-call.c file is missing a
default value for the TARGET_NO_PROTOTYPE value (which only affects targets
that don’t include svr4.h).  Fixed by moving the fallback setting from
rs6000.c (which has no uses now) to rs6000-call.c.

2019-07-21  Iain Sandoe  <iain@sandoe.co.uk>

	* config/rs6000/rs6000.c (TARGET_NO_PROTOTYPE): Move from here...
	* config/rs6000/rs6000-call.c: ... to here.

From-SVN: r273646

gcc/ChangeLog

+2019-07-21  Iain Sandoe  <iain@sandoe.co.uk>
+
+	* config/rs6000/rs6000.c (TARGET_NO_PROTOTYPE): Move from here...
+	* config/rs6000/rs6000-call.c: ... to here.
+
 2019-07-20  Segher Boessenkool  <segher@kernel.crashing.org>
 
 	* config/rs6000/predicates.md (offsettable_mem_operand): Allow volatile

gcc/config/rs6000/rs6000-call.c

@@ -86,6 +86,10 @@
 # endif
 #endif
 
+#ifndef TARGET_NO_PROTOTYPE
+#define TARGET_NO_PROTOTYPE 0
+#endif
+
 struct builtin_description
 {
   const HOST_WIDE_INT mask;

gcc/config/rs6000/rs6000.c

@@ -84,10 +84,6 @@
 /* This file should be included last.  */
 #include "target-def.h"
 
-#ifndef TARGET_NO_PROTOTYPE
-#define TARGET_NO_PROTOTYPE 0
-#endif
-
   /* Set -mabi=ieeelongdouble on some old targets.  In the future, power server
      systems will also set long double to be IEEE 128-bit.  AIX and Darwin
      explicitly redefine TARGET_IEEEQUAD and TARGET_IEEEQUAD_DEFAULT to 0, so