egl/main: cleanup function prototypes

Cleanup the function propotypes which were part of the previous EGL
drivers.

Signed-off-by: Emil Velikov <emil.l.velikov@gmail.com>
Reviewed-by: Marek Olšák <marek.olsak@amd.com>
Reviewed-by: Chad Versace <chad.versace@intel.com>

src/egl/main/egldriver.c

@@ -45,10 +45,6 @@
 #include "egldriver.h"
 #include "egllog.h"
 
-#ifdef _EGL_BUILT_IN_DRIVER_HAIKU
-_EGLDriver* _eglBuiltInDriverHaiku(const char* args);
-#endif
-
 typedef struct _egl_module {
    char *Name;
    _EGLMain_t BuiltIn;

src/egl/main/egldriver.h

@@ -91,20 +91,12 @@ struct _egl_driver
 };
 
 
-extern _EGLDriver *
-_eglBuiltInDriverGALLIUM(const char *args);
-
-
 extern _EGLDriver *
 _eglBuiltInDriverDRI2(const char *args);
 
 
-extern _EGLDriver *
-_eglBuiltInDriverGLX(const char *args);
-
-
-extern _EGLDriver *
-_eglMain(const char *args);
+extern _EGLDriver*
+_eglBuiltInDriverHaiku(const char* args);
 
 
 extern _EGLDriver *