fix(newlib): include missed test for printf

components/newlib/platform_include/stdio.h

@@ -10,5 +10,7 @@
 #include_next <stdio.h>
 
 #if CONFIG_LIBC_PICOLIBC
+void flockfile(FILE *);
+void funlockfile(FILE *);
 FILE *open_memstream(char **, size_t *);
 #endif

components/newlib/test_apps/newlib/main/CMakeLists.txt

@@ -5,6 +5,7 @@ set(srcs
     "test_misc.c"
     "test_memstream.c"
     "test_newlib.c"
+    "test_printf.c"
     "test_setjmp.c"
     "test_stdatomic.c"
     "test_time.c")