[build] CMake: Fix GRAPHICS check (#4359)

cmake/LibraryConfigurations.cmake

@@ -100,9 +100,10 @@ elseif ("${PLATFORM}" MATCHES "SDL")
 endif ()
 
 if (NOT ${OPENGL_VERSION} MATCHES "OFF")
-    set(${SUGGESTED_GRAPHICS} "${GRAPHICS}")
+    set(SUGGESTED_GRAPHICS "${GRAPHICS}")
+
     if (${OPENGL_VERSION} MATCHES "4.3")
-		set(GRAPHICS "GRAPHICS_API_OPENGL_43")
+        set(GRAPHICS "GRAPHICS_API_OPENGL_43")
     elseif (${OPENGL_VERSION} MATCHES "3.3")
         set(GRAPHICS "GRAPHICS_API_OPENGL_33")
     elseif (${OPENGL_VERSION} MATCHES "2.1")
@@ -114,8 +115,8 @@ if (NOT ${OPENGL_VERSION} MATCHES "OFF")
     elseif (${OPENGL_VERSION} MATCHES "ES 3.0")
         set(GRAPHICS "GRAPHICS_API_OPENGL_ES3")
     endif ()
-    if ("${SUGGESTED_GRAPHICS}" AND NOT "${SUGGESTED_GRAPHICS}" STREQUAL "${GRAPHICS}")
-        message(WARNING "You are overriding the suggested GRAPHICS=${SUGGESTED_GRAPHICS} with ${GRAPHICS}! This may fail")
+    if (NOT "${SUGGESTED_GRAPHICS}" STREQUAL "" AND NOT "${SUGGESTED_GRAPHICS}" STREQUAL "${GRAPHICS}")
+        message(WARNING "You are overriding the suggested GRAPHICS=${SUGGESTED_GRAPHICS} with ${GRAPHICS}! This may fail.")
     endif ()
 endif ()