all: Update to point to files in new shared/ directory.

Signed-off-by: Damien George <damien@micropython.org>

docs/develop/porting.rst

@@ -42,8 +42,8 @@ The basic MicroPython firmware is implemented in the main port file, e.g ``main.
    #include "py/gc.h"
    #include "py/mperrno.h"
    #include "py/stackctrl.h"
-   #include "lib/utils/gchelper.h"
-   #include "lib/utils/pyexec.h"
+   #include "shared/runtime/gchelper.h"
+   #include "shared/runtime/pyexec.h"
 
    // Allocate memory for the MicroPython GC heap.
    static char heap[4096];
@@ -106,10 +106,10 @@ We also need a Makefile at this point for the port:
    SRC_C = \
        main.c \
        mphalport.c \
-       lib/mp-readline/readline.c \
-       lib/utils/gchelper_generic.c \
-       lib/utils/pyexec.c \
-       lib/utils/stdout_helpers.c \
+       shared/readline/readline.c \
+       shared/runtime/gchelper_generic.c \
+       shared/runtime/pyexec.c \
+       shared/runtime/stdout_helpers.c \
 
    # Define the required object files.
    OBJ = $(PY_CORE_O) $(addprefix $(BUILD)/, $(SRC_C:.c=.o))