Manual merge of CL 4940744 because robomerge had issues.
Original Description:
Merging //Fortnite/Dev-Kairos to Main (//Fortnite/Main)
Getting ready for Install Bundle Manager merge to main. These are Engine/Core fixes
4440445
Fix FBuildPatchInstaller::Initialize() failing for manifests that did not include the empty tag.
#jira no jira
#rb Leigh.Swift
4474598
Add Android Macros to disable optimization
Fix Android directory iteration for OBBs. FindFilesRecursive() now works.
#jira UEATM-177
#rb Chris.Babcock
4487221
Android file - When mounting an OBB, fix possibly mounting directories as files.
#rb Chris.Babcock
4511214
Fix Android directory iteration not returning the visitor result. This would cause IPlatformFile::FindFilesRecursively() to prematurely end iteration.
#rb Chris.Babcock
4670945
Fix GetVarArgs format specifier off by 1 error. These would only show up if you had the format specifier at the end of the format string and only with 'l' and not 'll'. In that case the code would walk off the end of the format string, usually into another static string.
Fix GetVarArgs to never walk off the end of the format string.
#rb [at]ben.ziegler
4746778
Fix FShaderCodeEntry ref counts being off by one.
This bug was exposed because [Project Name Redacted] doesn't load shaderlibs or the PSO cache until well after engine init. That means some FShaderResource's are loaded before shader libs or PSO cache and FShaderCodeLibrary::RequestShaderCode() can fail in FShaderResource::SerializeShaderCode().
#rb [at]Gil.Gribb [at]Chris.Babcock
#ROBOMERGE-OWNER: ryan.vance
#ROBOMERGE-AUTHOR: justin.marcus
#ROBOMERGE-SOURCE: CL 4948018 in //UE4/Main/...
#ROBOMERGE-BOT: DEVVR (Main -> Dev-VR)
[CL 5026240 by justin marcus in Dev-VR branch]
