emulators/ppsspp: unbreak on armv6/armv7

SDL/SDLGLGraphicsContext.cpp:88:2: error: use of undeclared identifier 'EGL_Init'

EGL_Init();
^

SDL/SDLGLGraphicsContext.cpp:122:18: error: use of undeclared identifier 'g_eglDisplay'

eglSwapBuffers(g_eglDisplay, g_eglSurface);
               ^

SDL/SDLGLGraphicsContext.cpp:122:32: error: use of undeclared identifier 'g_eglSurface'

eglSwapBuffers(g_eglDisplay, g_eglSurface);
                             ^

SDL/SDLGLGraphicsContext.cpp:139:2: error: use of undeclared identifier 'EGL_Close'

EGL_Close();
^