builtins: Fix the sysroot's reference to si_int in int_types.h

[sgundapa]

Summary

si_int is already defined in sysroot's siginfo.h
emutls.c includes pthread.h which includes asm/siginfo.h which
in turn includes asm-generic/siginfo.h and that defines si_int.
si_int is also defined in builtin's int_types.h and this leads to
errors. This patch fixes the issue by undefining the si_int in int_types.h

[joerg]

Looks good with the comment change.

lib/builtins/int_types.h

23 ↗

(On Diff #41416)

Change that into Linux's asm-generic/siginfo.h please.

compiler-rt/trunk/lib/builtins/int_types.h

  * ===----------------------------------------------------------------------===
  */
 
 #ifndef INT_TYPES_H
 #define INT_TYPES_H
 
 #include "int_endianness.h"
 
+/* si_int is defined in Linux sysroot's asm-generic/siginfo.h */
+#ifdef si_int
+#undef si_int
+#endif
 typedef      int si_int;
 typedef unsigned su_int;
 
 typedef          long long di_int;
 typedef unsigned long long du_int;
 
 typedef union
 {