STYLE: fix indention

SuperBuild/CMake/External_glfw.cmake

-if(NOT __EXTERNAL_GLFW__)
-set(__EXTERNAL_GLFW__ 1)
+if(NOT __EXTERNAL_GLFW__w)
+  set(__EXTERNAL_GLFW__ 1)
 
-if(USE_SYSTEM_GLFW)
-  message(STATUS "  Using glfw system version")
-else()
-  set(GLFW_DEPENDENCIES)
-  set(GLFW_SB_BUILD_DIR ${CMAKE_BINARY_DIR}/GLFW/build)
-  set(GLFW_SB_SRC ${CMAKE_BINARY_DIR}/GLFW/src/GLFW)
+  if(USE_SYSTEM_GLFW)
+    message(STATUS "  Using GLFW system version")
+  else()
+    SETUP_SUPERBUILD(PROJECT GLFW)
+    message(STATUS "  Using GLFW SuperBuild version")
 
-  ExternalProject_Add(GLFW
-    PREFIX GLFW
-    URL "https://github.com/glfw/glfw/releases/download/3.1.2/glfw-3.1.2.zip"
-    URL_MD5 8023327bfe979b3fe735e449e2f54842
-    BINARY_DIR ${GLFW_SB_BUILD_DIR}
-    INSTALL_DIR ${CMAKE_INSTALL_PREFIX}
+    ExternalProject_Add(GLFW
+      PREFIX GLFW
+      URL "https://github.com/glfw/glfw/releases/download/3.1.2/glfw-3.1.2.zip"
+      URL_MD5 8023327bfe979b3fe735e449e2f54842
+      BINARY_DIR ${GLFW_SB_BUILD_DIR}
+      INSTALL_DIR ${CMAKE_INSTALL_PREFIX}
       DOWNLOAD_DIR ${DOWNLOAD_LOCATION}
-    CMAKE_CACHE_ARGS
+      CMAKE_CACHE_ARGS
       -DCMAKE_BUILD_TYPE:STRING=Release
       -DBUILD_SHARED_LIBS:BOOL=ON
       -DGLFW_BUILD_EXAMPLES:BOOL=OFF
       -DGLFW_BUILD_DOCS:BOOL=OFF
       -DGLFW_BUILD_TESTS:BOOL=OFF
       -DCMAKE_INSTALL_PREFIX:PATH=${CMAKE_INSTALL_PREFIX}
-  )
+      )
 
-  set(_SB_GLFW_INCLUDE_DIR ${SB_INSTALL_PREFIX}/include)
-  if(WIN32)
-    set(_SB_GLFW_LIBRARY ${SB_INSTALL_PREFIX}/lib/libglfw.lib)
-  elseif(UNIX)
-    set(_SB_GLFW_LIBRARY ${SB_INSTALL_PREFIX}/lib/libglfw${CMAKE_SHARED_LIBRARY_SUFFIX})
-  endif()
+    set(_SB_GLFW_INCLUDE_DIR ${SB_INSTALL_PREFIX}/include)
+    if(WIN32)
+      set(_SB_GLFW_LIBRARY ${SB_INSTALL_PREFIX}/lib/libglfw.lib)
+    elseif(UNIX)
+      set(_SB_GLFW_LIBRARY ${SB_INSTALL_PREFIX}/lib/libglfw${CMAKE_SHARED_LIBRARY_SUFFIX})
+    endif()
 
-  message(STATUS "  Using glfw SuperBuild version")
-endif()
+  endif()
 endif()