Fix the Makefile for test and fix targets. (#6913)

The bin/composer dependency was missing from half the targets that
needed it.
The vendor/bin/* targets are all created by a single call to composer,
but were all duplicating the composer call.
The php* tools defined a vendor/bin/php* target, but then proceeded to
create the bin/php* target instead by symlinking from an incorrect path.
php* tools were referenced as vendor/bin/php* even though they were
symlinked to bin/php*.

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