!7 feat: add sysinfo.h to kernel libc headfile

Merge pull request !7 from MGY917/master

kernel/include/sysinfo.h

+#ifndef _SYS_SYSINFO_H
+#define _SYS_SYSINFO_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+struct sysinfo {
+	unsigned long uptime;
+	unsigned long loads[3];
+	unsigned long totalram;
+	unsigned long freeram;
+	unsigned long sharedram;
+	unsigned long bufferram;
+	unsigned long totalswap;
+	unsigned long freeswap;
+	unsigned short procs, pad;
+	unsigned long totalhigh;
+	unsigned long freehigh;
+	unsigned mem_unit;
+	char __reserved[256];
+};
+
+int sysinfo (struct sysinfo *);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif