Make it possible to build bionic with -I instead of -isystem.
Various things:
* work around -Wnullability-completeness.
* use C++ casts in C++ and C casts in C.
* stop using attributes clang doesn't support (such as `warning`).
* remove duplicate definitions of XATTR_CREATE and XATTR_REPLACE.
Change-Id: I07649e46275b28a23ca477deea119fe843999533
diff --git a/libc/include/error.h b/libc/include/error.h
index 18ce379..05ce35d 100644
--- a/libc/include/error.h
+++ b/libc/include/error.h
@@ -33,14 +33,14 @@
__BEGIN_DECLS
-void error(int, int, const char* _Nonnull, ...) __printflike(3, 4) __INTRODUCED_IN(23);
-void error_at_line(int, int, const char*, unsigned int, const char* _Nonnull, ...) __printflike(5, 6)
- __INTRODUCED_IN(23);
-
-extern void (*error_print_progname)(void) __INTRODUCED_IN(23);
+extern void (* _Nullable error_print_progname)(void) __INTRODUCED_IN(23);
extern unsigned int error_message_count __INTRODUCED_IN(23);
extern int error_one_per_line __INTRODUCED_IN(23);
+void error(int, int, const char* _Nonnull, ...) __printflike(3, 4) __INTRODUCED_IN(23);
+void error_at_line(int, int, const char* _Nullable, unsigned int, const char* _Nonnull, ...)
+ __printflike(5, 6) __INTRODUCED_IN(23);
+
__END_DECLS
#endif