Code signing identity should be explicitly set by Projucer

[mcmartin]

@thecargocult please see

Did something change related to code-signing in 6.1.3 Projucer?

As master was recently updated to JUCE 6.1.3, I was trying to build a few things with that new version, and I noticed the following: (1) When I run my release script after the build (to prepare all binaries, manual, presets, etc… and create my installer package), I am now getting these warnings: /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/strip: warning: changes being made to the file will invalidate the code signature in: /Users/ktanghe/Documents/C…

and let’s continue the discussion there, instead of resurrecting old threads.