Fix compile with musl libc

[Steven Honeyman]

Using the latest git sources for musl libc and strace, there's just
one thing missing preventing it from working "out of the box".
To fix this. would it be possible to add the sys/sysinfo.h header in, as below:

--- a/strace-4.9/resource.c
+++ b/strace-4.9/resource.c
@@ -302,6 +302,8 @@
 }
 #endif /* ALPHA */

+#include <sys/sysinfo.h>
+
 int
 sys_sysinfo(struct tcb *tcp)
 {


With that in place, it works fine.

Thanks,
Steven