preadv2/pwritev2 requires glibc 2.26

Author: devnexen

compiler-rt/lib/sanitizer_common/sanitizer_platform_interceptors.h

@@ -599,8 +599,8 @@
 #define SANITIZER_INTERCEPT_ARGP_PARSE SI_GLIBC
 #define SANITIZER_INTERCEPT_CPUSET_GETAFFINITY SI_FREEBSD
 // FIXME: also available from musl 1.2.5
-#define SANITIZER_INTERCEPT_PREADV2 SI_GLIBC
-#define SANITIZER_INTERCEPT_PWRITEV2 SI_GLIBC
+#define SANITIZER_INTERCEPT_PREADV2 (SI_LINUX && __GLIBC_PREREQ(2, 26))
+#define SANITIZER_INTERCEPT_PWRITEV2 (SI_LINUX && __GLIBC_PREREQ(2, 26))
 
 // This macro gives a way for downstream users to override the above
 // interceptor macros irrespective of the platform they are on. They have