jdk7 1.7.0.75: Replace version underscore with dot
jdk7 1.7.0.75: Replace version underscore with dot

The underscore in the version number seems to confuse Homebrew and
make it think that the formula is always out of date.

maxim-belkin/homebrew-core,LinuxbrewTestBot/homebrew-core,Linuxbrew/homebrew-core,rwhogg/homebrew-core,Linuxbrew/homebrew-core,rwhogg/homebrew-core,LinuxbrewTestBot/homebrew-core,forevergenin/homebrew-core,maxim-belkin/homebrew-core,forevergenin/homebrew-core