sdlchecks.cmake: Small tune by @sezero

cmake/sdlchecks.cmake

@@ -647,9 +647,8 @@ macro(CheckWayland)
       string(REPLACE "wayland-scanner " "" WAYLAND_SCANNER_VERSION ${WAYLAND_SCANNER_VERSION})
 
       if(CMAKE_VERSION VERSION_LESS 3.7.0)
-        string(COMPARE GREATER ${WAYLAND_SCANNER_VERSION} "1.15.0" WAYLAND_SCANNER_1_15_FOUND_G)
-        string(COMPARE EQUAL ${WAYLAND_SCANNER_VERSION} "1.15.0" WAYLAND_SCANNER_1_15_FOUND_E)
-        if(WAYLAND_SCANNER_1_15_FOUND_G OR WAYLAND_SCANNER_1_15_FOUND_E)
+        string(COMPARE LESS ${WAYLAND_SCANNER_VERSION} "1.15.0" WAYLAND_SCANNER_1_15_NOTFOUND)
+        if(NOT WAYLAND_SCANNER_1_15_NOTFOUND)
           set(WAYLAND_SCANNER_1_15_FOUND TRUE)
         endif()
       else()