Fix library destination for DLL platforms

Fixes #1035.

README.md

@@ -174,6 +174,7 @@ information on what to include when reporting a bug.
 - [Win32] Bugfix: Vulkan libraries have a new path as of SDK 1.0.42.0 (#956)
 - [Win32] Bugfix: Monitors with no display devices were not enumerated (#960)
 - [Win32] Bugfix: Monitor events were not emitted (#784)
+- [Win32] Bugfix: The Cygwin DLL was installed to the wrong directory (#1035)
 - [X11] Moved to XI2 `XI_RawMotion` for disable cursor mode motion input (#125)
 - [X11] Replaced `_GLFW_HAS_XF86VM` compile-time option with dynamic loading
 - [X11] Bugfix: `glfwGetVideoMode` would segfault on Cygwin/X

src/CMakeLists.txt

@@ -129,6 +129,10 @@ if (MSVC)
 endif()
 
 if (GLFW_INSTALL)
-    install(TARGETS glfw EXPORT glfwTargets DESTINATION lib${LIB_SUFFIX})
+    install(TARGETS glfw
+            EXPORT glfwTargets
+            RUNTIME DESTINATION "bin"
+            ARCHIVE DESTINATION "lib${LIB_SUFFIX}"
+            LIBRARY DESTINATION "lib${LIB_SUFFIX}")
 endif()