Fixes a missing include in glibc. It is needed for riscv64 targets.
This patch can be removed when we upgrade glibc to > 2.27.

diff --git a/sysdeps/unix/sysv/linux/riscv/flush-icache.c b/sysdeps/unix/sysv/linux/riscv/flush-icache.c
index d612ef4c6c..0b2042620b 100644
--- a/sysdeps/unix/sysv/linux/riscv/flush-icache.c
+++ b/sysdeps/unix/sysv/linux/riscv/flush-icache.c
@@ -21,7 +21,11 @@
 #include <stdlib.h>
 #include <atomic.h>
 #include <sys/cachectl.h>
-#include <asm/syscalls.h>
+#if __has_include (<asm/syscalls.h>)
+# include <asm/syscalls.h>
+#else
+# include <asm/unistd.h>
+#endif
 
 typedef int (*func_type) (void *, void *, unsigned long int);
 
-- 
2.31.1