Enable io.IOBase so we can construct a RequestsStreamWrapper in Python code

Author: jepler

py/circuitpy_mpconfig.h

@@ -142,6 +142,7 @@ extern void common_hal_mcu_enable_interrupts(void);
 #define MICROPY_PY_GC                    (1)
 // Supplanted by shared-bindings/math
 #define MICROPY_PY_IO                    (CIRCUITPY_IO)
+#define MICROPY_PY_IO_IOBASE             (CIRCUITPY_IO_IOBASE)
 // In extmod
 #define MICROPY_PY_JSON                 (CIRCUITPY_JSON)
 #define MICROPY_PY_MATH                  (0)

py/circuitpy_mpconfig.mk

@@ -302,6 +302,10 @@ CFLAGS += -DCIRCUITPY_IMAGECAPTURE=$(CIRCUITPY_IMAGECAPTURE)
 CIRCUITPY_IO ?= $(CIRCUITPY_JSON)
 CFLAGS += -DCIRCUITPY_IO=$(CIRCUITPY_IO)
 
+# io.IOBase - enhances JPEG support
+CIRCUITPY_IO_IOBASE ?= $(call enable-if-all,$(CIRCUITPY_IO) $(CIRCUITPY_JPEGIO))
+CFLAGS += -DCIRCUITPY_IO_IOBASE=$(CIRCUITPY_IO_IOBASE)
+
 CIRCUITPY_IPADDRESS ?= $(CIRCUITPY_WIFI)
 CFLAGS += -DCIRCUITPY_IPADDRESS=$(CIRCUITPY_IPADDRESS)