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Check that pins needed by Wire are defined at compile-time (esp8266#4261)

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Original file line number	Diff line number	Diff line change
`@@ -30,6 +30,13 @@ extern "C" {`
`30`	`30`	`#include"twi.h"`
`31`	`31`	`#include"Wire.h"`
`32`	`32`
	`33`	`+`
	`34`	`+//Some boards don't have these pins available, and hence don't support Wire.`
	`35`	`+//Check here for compile-time error.`
	`36`	`+#if !defined(PIN_WIRE_SDA) \|\| !defined(PIN_WIRE_SCL)`
	`37`	`+#error Wire library is not supported on this board`
	`38`	`+#endif`
	`39`	`+`
`33`	`40`	`// Initialize Class Variables //////////////////////////////////////////////////`
`34`	`41`
`35`	`42`	`uint8_t TwoWire::rxBuffer[BUFFER_LENGTH];`

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