msgbuf: Remove duplicate fixup of _Static_assert() for C++

Not entirely sure how we didn't catch this previously.

Fixes: 062c8762c7eb ("msgbuf: Add insert and span APIs")
Signed-off-by: Andrew Jeffery <andrew@aj.id.au>
Change-Id: I1fcff90cb9f31fb3f5036393201a8ab5e27724b7
diff --git a/src/msgbuf.h b/src/msgbuf.h
index 62992a0..128b4be 100644
--- a/src/msgbuf.h
+++ b/src/msgbuf.h
@@ -22,16 +22,6 @@
 #include <string.h>
 #include <sys/types.h>
 
-/*
- * Fix up C11's _Static_assert() vs C++'s static_assert().
- *
- * Can we please have nice things for once.
- */
-#ifdef __cplusplus
-// NOLINTNEXTLINE(bugprone-reserved-identifier,cert-dcl37-c,cert-dcl51-cpp)
-#define _Static_assert(...) static_assert(__VA_ARGS__)
-#endif
-
 struct pldm_msgbuf {
 	uint8_t *cursor;
 	ssize_t remaining;