Cleanup

Cleanup of 8bdb105897.

Add build macro to configuration header and documentation.  Add
corresponding CMake option.  Add change log entry and credit.  Add
loader static library to link dependencies and add detection to
FindVulkan.cmake.

README.md

@@ -93,6 +93,8 @@ information on what to include when reporting a bug.
 ## Changelog
 
  - Added on-demand loading of Vulkan and context creation API libraries
+ - Added `_GLFW_VULKAN_STATIC` build macro to make the library use the Vulkan
+   loader linked statically into the application
  - Bugfix: Single compilation unit builds failed due to naming conflicts (#783)
  - Bugfix: The range checks for `glfwSetCursorPos` used the wrong minimum (#773)
  - [Win32] Bugfix: `glfwSetClipboardString` created an unnecessary intermediate
@@ -208,6 +210,7 @@ skills.
  - Emmanuel Gil Peyrot
  - Cyril Pichard
  - Pieroman
+ - Philip Rideout
  - Jorge Rodriguez
  - Ed Ropple
  - Aleksey Rybalkin