Add strchr() and putchar() to local C library

Change-Id: I3659e119a242f8ef828e32bfdf5d0b4b7ac4f716
diff --git a/lib/stdlib/std.c b/lib/stdlib/std.c
index b6acf43..a9fc8ed 100644
--- a/lib/stdlib/std.c
+++ b/lib/stdlib/std.c
@@ -34,6 +34,8 @@
 #include "assert.c"
 #include "mem.c"
 #include "printf.c"
+#include "putchar.c"
 #include "puts.c"
+#include "strchr.c"
 #include "strlen.c"
 #include "subr_prf.c"