cmake: Do a more thorough test for the old bcm Raspberry Pi libraries.

Fixes #5132.

cmake/sdlchecks.cmake

@@ -1221,7 +1221,11 @@ macro(CheckRPI)
     set(CMAKE_REQUIRED_LIBRARIES "${VIDEO_RPI_LIBRARIES}")
     check_c_source_compiles("
         #include <bcm_host.h>
-        int main(int argc, char **argv) {}" HAVE_RPI)
+        #include <EGL/eglplatform.h>
+        int main(int argc, char **argv) {
+          EGL_DISPMANX_WINDOW_T window;
+          bcm_host_init();
+        }" HAVE_RPI)
     set(CMAKE_REQUIRED_FLAGS "${ORIG_CMAKE_REQUIRED_FLAGS}")
     set(CMAKE_REQUIRED_LIBRARIES)