The KMS backend requires a hardware pipe driver. Do not build
egl_kms_swrast. Also, only build egl_fbdev_swrast for fbdev backend.
It is a pure software backend.
##### TARGETS #####
+ifeq ($(EGL_DRIVER_NAME),swrast)
+EGL_DISPLAYS := $(filter-out kms, $(EGL_DISPLAYS))
+else
+EGL_DISPLAYS := $(filter-out fbdev, $(EGL_DISPLAYS))
+endif
+
EGL_DISPLAY_DRIVERS = $(foreach dpy, $(EGL_DISPLAYS), egl_$(dpy)_$(EGL_DRIVER_NAME).so)
EGL_DISPLAY_LIBS = $(foreach drv, $(EGL_DISPLAY_DRIVERS), $(TOP)/$(LIB_DIR)/egl/$(drv))