make: fix list of targets for which .d are pulled
make: fix list of targets for which .d are pulled

all_targets was overloaded to be both:
1- the list of default targets
2- the list of targets for which we pull .d files

As it got modified to only include a subset of targets for (1), it broke some of (2) leading to unnecessary rebuilds.
This fixes it.
Review URL: http://codereview.chromium.org/335043
witwall/gyp,witwall/gyp,witwall/gyp,witwall/gyp,witwall/gyp