Don't wipe everything is only sketch path changed #129
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If the environment variables are untouched but the sketch is saved automatically by the Java IDE (to another folder) the infamous "Build options changed" is triggered.
This commits adds a second check after removing the sketch location from the env variables, and skips the wipeout if the partial environments are equals
Should solve arduino/Arduino#4713
@matthijskooijman @cmaglie @sandeepmistry @mbanzi