build: remove dependency on modified folly repository

Currently we pull a modified folly repository to be able to use it header only.
The only difference in this repository is adding the `folly-config.h` file.
Pull this patch into this repo instead and use upstream folly.

Bump folly to latest main as well.

Test plan:
- CI build. I have local build issues at the moment.

Author: JakeHillion

CMakeLists.txt

@@ -89,9 +89,10 @@ include_directories(SYSTEM "${rocksdb_SOURCE_DIR}/include")
 ### use folly as a header only library. some features won't be supported.
 FetchContent_Declare(
   folly
-  GIT_REPOSITORY https://github.com/JakeHillion/folly.git
-  GIT_TAG        8db54418e3ccdd97619ac8b69bb3702f82bb0f66
+  GIT_REPOSITORY https://github.com/facebook/folly.git
+  GIT_TAG        c5aa5c46291a27f69acc920894d43605ceb43eba
   GIT_PROGRESS   TRUE
+  PATCH_COMMAND  ${CMAKE_COMMAND} -E copy ${CMAKE_CURRENT_SOURCE_DIR}/extern/shim-folly-config.h folly/folly-config.h
 )
 FetchContent_Populate(folly)