package/freescale-imx/imx-gpu-viv: make pkg-config fixups mutually exclusive

The IMX_GPU_VIV_FIXUP_PKGCONFIG fixup is defined conditionally
depending on the value of IMX_GPU_VIV_LIB_TARGET, which means that
obviously only one of the definitions is possible. Make this clear by
using a ifeq ... else ifeq ... else ifeq ... endif logic.

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
Reviewed-by: Gary Bisson <gary.bisson@boundarydevices.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>

package/freescale-imx/imx-gpu-viv/imx-gpu-viv.mk

@@ -46,15 +46,11 @@ ifeq ($(IMX_GPU_VIV_LIB_TARGET),fb)
 define IMX_GPU_VIV_FIXUP_PKGCONFIG
 	ln -sf egl_linuxfb.pc $(@D)/gpu-core/usr/lib/pkgconfig/egl.pc
 endef
-endif
-
-ifeq ($(IMX_GPU_VIV_LIB_TARGET),wayland)
+else ifeq ($(IMX_GPU_VIV_LIB_TARGET),wayland)
 define IMX_GPU_VIV_FIXUP_PKGCONFIG
 	ln -sf egl_wayland.pc $(@D)/gpu-core/usr/lib/pkgconfig/egl.pc
 endef
-endif
-
-ifeq ($(IMX_GPU_VIV_LIB_TARGET),x11)
+else ifeq ($(IMX_GPU_VIV_LIB_TARGET),x11)
 define IMX_GPU_VIV_FIXUP_PKGCONFIG
 	for lib in egl gbm glesv1_cm glesv2 vg; do \
 		ln -sf $${lib}_x11.pc $(@D)/gpu-core/usr/lib/pkgconfig/$${lib}.pc || exit 1; \