esp32: Enable workaround for math.gamma(-inf) result.

Without this commit, math.gamma(-float("inf")) returns inf instead of
raising a math domain ValueError. Needed for float/math_domain_special.py
test to pass on esp32.

Root cause is an upstream libm bug, has been reported to ESP-IDF.

This work was funded through GitHub Sponsors.
Signed-off-by: Angus Gratton <angus@redyak.com.au>

ports/esp32/mpconfigport.h

@@ -282,6 +282,10 @@ typedef long mp_off_t;
 #define MICROPY_PY_MACHINE_BOOTLOADER       (0)
 #endif
 
+// Workaround for upstream bug https://github.com/espressif/esp-idf/issues/14273
+// Can be removed if a fix is available in supported ESP-IDF versions.
+#define MICROPY_PY_MATH_GAMMA_FIX_NEGINF (1)
+
 #ifndef MICROPY_BOARD_STARTUP
 #define MICROPY_BOARD_STARTUP boardctrl_startup
 #endif