package/nvidia-driver: install an egl.pc

A lot of packages expect an egl.pc to decide that EGL is available. So,
provide one.

As suggested by Alexandre, use the one from nvidia-tegra23 as template.

Reported-by: Alexandre Maumené <alexandre@maumene.org>
Signed-off-by: "Yann E. MORIN" <yann.morin.1998@free.fr>
Cc: Alexandre Maumené <alexandre@maumene.org>
Cc: Arnout Vandecappelle <arnout@mind.be>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
(cherry picked from commit 05a86bdf1fa9071de9701fba058d47d80a0925bd)
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/nvidia-driver/egl.pc

@@ -0,0 +1,10 @@
+prefix=/usr
+exec_prefix=${prefix}
+libdir=${exec_prefix}/lib
+includedir=${prefix}/include
+
+Name: egl
+Description: Nvidia OpenGL library
+Version: 1
+Cflags: -I${includedir}
+Libs: -L${libdir} -lEGL

package/nvidia-driver/nvidia-driver.mk

@@ -78,6 +78,7 @@ define NVIDIA_DRIVER_INSTALL_GL_DEV
 	$(SED) 's:__LIBGL_PATH__:/usr/lib:' $(STAGING_DIR)/usr/lib/libGL.la
 	$(SED) 's:-L[^[:space:]]\+::' $(STAGING_DIR)/usr/lib/libGL.la
 	$(INSTALL) -D -m 0644 package/nvidia-driver/gl.pc $(STAGING_DIR)/usr/lib/pkgconfig/gl.pc
+	$(INSTALL) -D -m 0644 package/nvidia-driver/egl.pc $(STAGING_DIR)/usr/lib/pkgconfig/egl.pc
 endef
 
 # Those libraries are 'private' libraries requiring an agreement with