crt: Add missing __cdecl for __local_stdio_*_options functions

Signed-off-by: Martin Storsjö <martin@martin.st>
diff --git a/mingw-w64-crt/stdio/ucrt___local_stdio_printf_options.c b/mingw-w64-crt/stdio/ucrt___local_stdio_printf_options.c
index 986c4fd..ee98ac1 100644
--- a/mingw-w64-crt/stdio/ucrt___local_stdio_printf_options.c
+++ b/mingw-w64-crt/stdio/ucrt___local_stdio_printf_options.c
@@ -10,6 +10,6 @@
 
 static unsigned __int64 options = _CRT_INTERNAL_PRINTF_LEGACY_WIDE_SPECIFIERS | _CRT_INTERNAL_PRINTF_STANDARD_ROUNDING;
 
-unsigned __int64* __local_stdio_printf_options(void) {
+unsigned __int64* __cdecl __local_stdio_printf_options(void) {
   return &options;
 }
diff --git a/mingw-w64-crt/stdio/ucrt___local_stdio_scanf_options.c b/mingw-w64-crt/stdio/ucrt___local_stdio_scanf_options.c
index 2dbd324..e10a831 100644
--- a/mingw-w64-crt/stdio/ucrt___local_stdio_scanf_options.c
+++ b/mingw-w64-crt/stdio/ucrt___local_stdio_scanf_options.c
@@ -10,6 +10,6 @@
 
 static unsigned __int64 options = _CRT_INTERNAL_SCANF_LEGACY_WIDE_SPECIFIERS;
 
-unsigned __int64* __local_stdio_scanf_options(void) {
+unsigned __int64* __cdecl __local_stdio_scanf_options(void) {
   return &options;
 }
diff --git a/mingw-w64-headers/crt/corecrt_stdio_config.h b/mingw-w64-headers/crt/corecrt_stdio_config.h
index 7ac0e6e..366d90a 100644
--- a/mingw-w64-headers/crt/corecrt_stdio_config.h
+++ b/mingw-w64-headers/crt/corecrt_stdio_config.h
@@ -13,8 +13,8 @@
 extern "C" {
 #endif
 
-unsigned __int64* __local_stdio_printf_options(void);
-unsigned __int64* __local_stdio_scanf_options(void);
+unsigned __int64* __cdecl __local_stdio_printf_options(void);
+unsigned __int64* __cdecl __local_stdio_scanf_options(void);
 
 #define _CRT_INTERNAL_PRINTF_LEGACY_VSPRINTF_NULL_TERMINATION  0x0001ULL
 #define _CRT_INTERNAL_PRINTF_STANDARD_SNPRINTF_BEHAVIOR        0x0002ULL