Apply custom format/length modifier removal to spprintf

This mimicks the changes made to the custom snprintf implementation
by removing the custom 'v' format and custom 'I' length modifier
from the spprintf implementation.

Closes GH-5108

Author: Girgias

UPGRADING.INTERNALS

@@ -82,12 +82,12 @@ PHP 8.0 INTERNALS UPGRADE NOTES
      compare handler, using ZEND_COMPARE_OBJECTS_FALLBACK() macro.
 
   k. The 'I' length modifier, used to denote 32 and 64bit integer from the custom
-     snprintf implementation has been removed.
+     snprintf and spprintf implementations has been removed.
      Use the ZEND_LONG_FMT, ZEND_ULONG_FMT and ZEND_XLONG_FMT macros defined in
      php-src/Zend/zend_long.h
 
-     The 'v' format from the custom snprintf implementation has been removed.
-     Use the standard 's' format instead.
+     The 'v' format from the custom snprintf and spprintf implementations has
+     been removed. Use the standard 's' format instead.
 
 ========================
 2. Build system changes

main/spprintf.c

@@ -312,25 +312,6 @@ static void xbuf_format_converter(void *xbuf, zend_bool is_char, const char *fmt
 					fmt++;
 					modifier = LM_LONG_DOUBLE;
 					break;
-				case 'I':
-					fmt++;
-#if SIZEOF_LONG_LONG
-					if (*fmt == '6' && *(fmt+1) == '4') {
-						fmt += 2;
-						modifier = LM_LONG_LONG;
-					} else
-#endif
-						if (*fmt == '3' && *(fmt+1) == '2') {
-							fmt += 2;
-							modifier = LM_LONG;
-						} else {
-#ifdef _WIN64
-							modifier = LM_LONG_LONG;
-#else
-							modifier = LM_LONG;
-#endif
-						}
-					break;
 				case 'l':
 					fmt++;
 #if SIZEOF_LONG_LONG
@@ -587,7 +568,6 @@ static void xbuf_format_converter(void *xbuf, zend_bool is_char, const char *fmt
 
 
 				case 's':
-				case 'v':
 					s = va_arg(ap, char *);
 					if (s != NULL) {
 						if (!adjust_precision) {