[PATCH 2/2] include: Fix compiling bool with C23 enabled compilers

[Michael Neuling]

C23 pre-definies bool so we need to gate our defines.

Without this C23 enabled compiler gives this error:

   CC        lib/sbi/riscv_asm.o
  In file included from /home/mneuling/src/opensbi/include/sbi/sbi_scratch.h:54,
		   from /home/mneuling/src/opensbi/include/sbi/sbi_platform.h:49,
		   from /home/mneuling/src/opensbi/lib/sbi/riscv_asm.c:13:
  /home/mneuling/src/opensbi/include/sbi/sbi_types.h:47:33: error: two or more data types in declaration specifiers
     47 | typedef int                     bool;
	|                                 ^~~~
  /home/mneuling/src/opensbi/include/sbi/sbi_types.h:47:1: error: useless type name in empty declaration [-Werror]
     47 | typedef int                     bool;
	| ^~~~~~~
  cc1: all warnings being treated as errors

Signed-off-by: Michael Neuling <michaelneuling at tenstorrent.com>
---
 include/sbi/sbi_types.h | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/include/sbi/sbi_types.h b/include/sbi/sbi_types.h
index def88bbad2..3f054f481a 100644
--- a/include/sbi/sbi_types.h
+++ b/include/sbi/sbi_types.h
@@ -44,7 +44,12 @@ typedef unsigned long long	uint64_t;
 #error "Unexpected __riscv_xlen"
 #endif
 
+#if __STDC_VERSION__ < 202311L
 typedef int			bool;
+#define true			1
+#define false			0
+#endif
+
 typedef unsigned long		ulong;
 typedef unsigned long		uintptr_t;
 typedef unsigned long		size_t;
@@ -61,9 +66,6 @@ typedef uint32_t		be32_t;
 typedef uint64_t		le64_t;
 typedef uint64_t		be64_t;
 
-#define true			1
-#define false			0
-
 #define NULL			((void *)0)
 
 #define __packed		__attribute__((packed))
-- 
2.34.1