Move sysinfo parser to a separate file

* sysinfo.c: New file.
* Makefile.am (strace_SOURCES): Add it.
* resource.c (sys_sysinfo): Move to sysinfo.c.
diff --git a/Makefile.am b/Makefile.am
index b76c979..703f4da 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -51,6 +51,7 @@
 	strace.c	\
 	stream.c	\
 	syscall.c	\
+	sysinfo.c	\
 	system.c	\
 	term.c		\
 	time.c		\