Tweak swis.h for older C standards

Prior to C18, you couldn't have duplicate typedefs (even if identical) so
if you `#include` both `<stdio.h>` and `"swis.h"` the `typedef __va_list`
conflicted if you specified `-c90` or `-c99`. (The header was already
incompatible with `-pcc`.)


Version 6.13. Not tagged

VersionASM

@@ -12,9 +12,9 @@
 Module_MajorVersion     SETS    "6.13"
 Module_Version          SETA    613
 Module_MinorVersion     SETS    ""
-Module_Date             SETS    "15 Jun 2022"
-Module_ApplicationDate  SETS    "15-Jun-22"
+Module_Date             SETS    "16 Jun 2022"
+Module_ApplicationDate  SETS    "16-Jun-22"
 Module_ComponentName    SETS    "RISC_OSLib"
 Module_FullVersion      SETS    "6.13"
-Module_HelpVersion      SETS    "6.13 (15 Jun 2022)"
+Module_HelpVersion      SETS    "6.13 (16 Jun 2022)"
                         END

VersionNum

@@ -5,17 +5,17 @@
  */
 #define Module_MajorVersion_CMHG        6.13
 #define Module_MinorVersion_CMHG
-#define Module_Date_CMHG                15 Jun 2022
+#define Module_Date_CMHG                16 Jun 2022
 
 #define Module_MajorVersion             "6.13"
 #define Module_Version                  613
 #define Module_MinorVersion             ""
-#define Module_Date                     "15 Jun 2022"
+#define Module_Date                     "16 Jun 2022"
 
-#define Module_ApplicationDate          "15-Jun-22"
+#define Module_ApplicationDate          "16-Jun-22"
 
 #define Module_ComponentName            "RISC_OSLib"
 
 #define Module_FullVersion              "6.13"
-#define Module_HelpVersion              "6.13 (15 Jun 2022)"
+#define Module_HelpVersion              "6.13 (16 Jun 2022)"
 #define Module_LibraryVersionInfo       "6:13"

h/swisheader

@@ -34,7 +34,7 @@ extern "C"
 {
 #endif
 
-typedef char *__va_list[1];       /* keep in step with <stdarg.h> */
+typedef char *__va_listswi[1];    /* keep in step with <stdarg.h>, can't share __va_list pre-C18 */
 
 #pragma -v4
 extern int _swi (int swi_no, unsigned int, ...);
@@ -42,9 +42,9 @@ extern int _swi (int swi_no, unsigned int, ...);
 extern _kernel_oserror *_swix (int swi_no, unsigned int, ...);
 #pragma -v0
 
-extern int _vswi (int swi_no, unsigned int, __va_list);
+extern int _vswi (int swi_no, unsigned int, __va_listswi);
 
-extern _kernel_oserror *_vswix (int swi_no, unsigned int, __va_list);
+extern _kernel_oserror *_vswix (int swi_no, unsigned int, __va_listswi);
 
 #ifdef __cplusplus
 }