Fixing parallel builds

[LeStarch]

Originating Project/Creator
Affected Component
Affected Architectures(s)
Related Issue(s)
Has Unit Tests (y/n)
Builds Without Errors (y/n)
Unit Tests Pass (y/n)
Documentation Included (y/n)

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Change Description

Fixes the parallel build -jN flag passing. This has been broken since at least v3.0.0.

Rationale

Builds should be fast

Testing/Review Recommendations

• Tested fprime-util build -j16
• Tested fprime-util check -j16

Much faster.

Future Work

None

[LeStarch]

An explanation of the fix:

The job flag may be supplied to any target in make, however "all targets" were objects and the "command" was a string. This checks against the mnemonic flags instead.