Update mysql55 formula with the latest changes in the main mysql one

Included changes:

2e81448c576b5b7296e813aa31a6e537cb14d4e8
3bffe5629cbf6b308ec045621339214b468fee2d
734f082db9da334eb66f9122e916161db9e69618
d6996fcdfc5fd5d356d142d532e23b0ac405adf6