Remove unneccessary quotes in CMake conditions

(cherry picked from commit 87d5646f5d2bad0562744501633bf8105f59c193)

CMakeLists.txt

@@ -84,17 +84,17 @@ if (MSVC)
 endif()
 
 if (MSVC AND NOT USE_MSVC_RUNTIME_LIBRARY_DLL)
-    if (${CMAKE_VERSION} VERSION_LESS 3.15)
+    if (CMAKE_VERSION VERSION_LESS 3.15)
         foreach (flag CMAKE_C_FLAGS
                       CMAKE_C_FLAGS_DEBUG
                       CMAKE_C_FLAGS_RELEASE
                       CMAKE_C_FLAGS_MINSIZEREL
                       CMAKE_C_FLAGS_RELWITHDEBINFO)
 
-            if (${flag} MATCHES "/MD")
+            if (flag MATCHES "/MD")
                 string(REGEX REPLACE "/MD" "/MT" ${flag} "${${flag}}")
             endif()
-            if (${flag} MATCHES "/MDd")
+            if (flag MATCHES "/MDd")
                 string(REGEX REPLACE "/MDd" "/MTd" ${flag} "${${flag}}")
             endif()
 
@@ -269,7 +269,7 @@ if (_GLFW_WAYLAND)
     check_include_files(xkbcommon/xkbcommon-compose.h HAVE_XKBCOMMON_COMPOSE_H)
     check_function_exists(memfd_create HAVE_MEMFD_CREATE)
 
-    if (NOT ("${CMAKE_SYSTEM_NAME}" STREQUAL "Linux"))
+    if (NOT CMAKE_SYSTEM_NAME STREQUAL "Linux")
         find_package(EpollShim)
         if (EPOLLSHIM_FOUND)
             list(APPEND glfw_INCLUDE_DIRS "${EPOLLSHIM_INCLUDE_DIRS}")