Revert "(Temporarliy) revert weak delay binding, until"

This reverts commit 9d3250b.

Standard Arduino Core calls yield() on delay() periodically. ESP8266 at least calls yield() once
on delay(). Not calling yield() at all deviates too much from expected behavior, IMHO.
The most reasonable way to provide ESP32 porters of sketches and libraries a similar
capability is to make delay() pluggable, such that what is added to yield() can be added to
delay() as well.

Author: dok-net

cores/esp32/esp32-hal-misc.c

@@ -141,11 +141,13 @@ unsigned long IRAM_ATTR millis()
     return (unsigned long) (esp_timer_get_time() / 1000ULL);
 }
 
-void delay(uint32_t ms)
+void __delay(uint32_t ms)
 {
     vTaskDelay(ms / portTICK_PERIOD_MS);
 }
 
+void delay(uint32_t ms) __attribute__ ((weak, alias("__delay"))); 
+
 void IRAM_ATTR delayMicroseconds(uint32_t us)
 {
     uint32_t m = micros();