Convert boot/ and commands/ over to bsdmake

commands/sync/Makefile

@@ -0,0 +1,5 @@
+PROG=	sync
+BINDIR=	/bin
+MAN=
+
+.include <minix.prog.mk>

commands/sync/sync.c

@@ -0,0 +1,14 @@
+/* sync - flush the file system buffers.  Author: Andy Tanenbaum */
+
+#include <sys/types.h>
+#include <unistd.h>
+
+_PROTOTYPE(int main, (void));
+
+int main()
+{
+/* First prize in shortest useful program contest. */
+/* Highest comment/code ratio */
+  sync();
+  return(0);
+}