Revert "Update select.mk"

This reverts commit 0b2f3410b6468b3bf3725ec74541ef3a14469246.
Revert "Update select.mk"

This reverts commit 206fa0b227b7fce1bf0eb4f95b094c96647d1bb9.
Revert "Update select.mk"

This reverts commit fe99f22b35c7cf96ce8e4dba92f798d86d32c71b.
Revert "extraneous elves"

This reverts commit e8419dc224c93ed16e1d0c7ea6df948628ccbf7d.
Revert "The GCC Optimization Levels AGAIN [1/2]"

This reverts commit 15968ca9ceb8962cfa61a45165a4ec6f3c3d9eb4.
Revert "Rework if statements for GCC Level. [1/2]"

This reverts commit 82207f9f086708da87d694641883c2171d52dc42.
Revert "Allow defining multiple GCC O Levels 2/2"

This reverts commit e8dee362c32f4357f8309ab20e4d3e7cc0c2e1c4.