Refactored ksecprintf -> secprintf. Secure code is now all in common libtest161.

This library gets linked in by default in userland, and the common files are
included in the kernel.

userland/lib/libtest161/Makefile

@@ -0,0 +1,17 @@
+#
+# libtest - library of common test support code
+#
+
+TOP=../../..
+.include "$(TOP)/mk/os161.config.mk"
+
+COMMON=$(TOP)/common/libtest161
+
+SRCS+=\
+	$(COMMON)/secure.c \
+	$(COMMON)/sha256.c \
+	$(COMMON)/test161.c \
+
+LIB=test161
+
+.include  "$(TOP)/mk/os161.lib.mk"