Update docs to remove "experimental" warnings for windows and osx USD…

… builds.

(Internal change: 2256076)

README.md

@@ -35,14 +35,10 @@ If you are experiencing undocumented problems with the software, please
 Supported Platforms
 -------------------
 
-USD is currently supported on Linux platforms and has been built and tested
-on CentOS 7 and RHEL 7.
-
-We are actively working on porting USD to both Windows and Mac platforms (Please 
-see [VERSIONS.md](VERSIONS.md) for explicitly tested versions). Support for both
-platforms should be considered experimental at this time. Currently, the tree 
-will build on Mac and Windows, but only limited testing has been done on these 
-platforms.
+USD is primarily developed on Linux platforms (CentOS 7), but is built, tested 
+and supported on macOS and Windows.
+
+Please see [VERSIONS.md](VERSIONS.md) for explicitly tested versions. 
 
 Dependencies
 ------------

cmake/defaults/ProjectDefaults.cmake

@@ -28,7 +28,6 @@ if(APPLE)
     set(CMAKE_BUILD_WITH_INSTALL_RPATH FALSE)
     set(CMAKE_DYLIB_INSTALL_NAME_DIR "${CMAKE_INSTALL_PREFIX}/lib" CACHE STRING "install_name path for dylib.")
     list(FIND CMAKE_PLATFORM_IMPLICIT_LINK_DIRECTORIES "${CMAKE_INSTALL_PREFIX}/lib" isSystemDir)
-    message(WARNING "Building USD on Mac OSX is currently experimental.")
 
     # Workaround for code signing issues that show up as warnings at the end
     # of the build like:
@@ -43,10 +42,6 @@ if(APPLE)
     if (CMAKE_HOST_SYSTEM_VERSION VERSION_GREATER_EQUAL 20)
         set(CMAKE_XCODE_ATTRIBUTE_OTHER_CODE_SIGN_FLAGS "-o linker-signed")
     endif()
-
-elseif(WIN32)
-    # Windows specific set up
-    message(WARNING "Building USD on Windows is currently experimental.")
 endif()
 
 # Allow local includes from source directory.