mesa: fold GL ES 3 packages into GL ES 2 ones

OpenGL ES 3 is closely tied to the OpenGL ES 2: there is no separate
library, one can use GL ES 2 headers for GL ES 3 app, etc. Instead of
having separate packages, merge GL ES 3 packages into GL ES 2 ones.

Suggested-by: Böszörményi Zoltán <zboszor@gmail.com>
(From OE-Core rev: 7c0e9c170db93d9af7cc505dcd71c4f3d6c4e9c5)

Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com>
Signed-off-by: Mathieu Dubois-Briand <mathieu.dubois-briand@bootlin.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/recipes-graphics/mesa/mesa.inc

@@ -231,17 +231,10 @@ CFLAGS:append:armv6 = " -DMISSING_64BIT_ATOMICS"
 # Remove the mesa dependency on mesa-dev, as mesa is empty
 DEV_PKG_DEPENDENCY = ""
 
-# Khronos documentation says that include/GLES2/gl2ext.h can be used for
-# OpenGL ES 3 specification as well as for OpenGL ES 2.
-# There can be applications including GLES2/gl2ext.h instead of GLES3/gl3ext.h
-# meaning we should probably bring in GLES2/gl2ext.h if someone asks for
-# development package of libgles3.
-RDEPENDS:libgles3-mesa-dev += "libgles2-mesa-dev"
-
 # GLES2 and GLES3 implementations are packaged in a single library in libgles2-mesa.
 # Add a dependency so the GLES3 dev package is associated with its implementation.
-RDEPENDS:libgles2-mesa += "libgles3-mesa"
-ALLOW_EMPTY:libgles3-mesa = "1"
+RPROVIDES:libgles2-mesa += "libgles3-mesa"
+RPROVIDES:libgles2-mesa-dev += "libgles3-mesa-dev"
 
 RDEPENDS:libopencl-mesa += "${@bb.utils.contains('PACKAGECONFIG', 'opencl', 'libclc spirv-tools spirv-llvm-translator', '', d)}"
 
@@ -253,7 +246,6 @@ PACKAGES =+ "libegl-mesa libegl-mesa-dev \
              libgbm libgbm-dev \
              libgles1-mesa libgles1-mesa-dev \
              libgles2-mesa libgles2-mesa-dev \
-             libgles3-mesa libgles3-mesa-dev \
              libopencl-mesa libopencl-mesa-dev \
              libxatracker libxatracker-dev \
              mesa-megadriver mesa-vulkan-drivers \
@@ -278,8 +270,7 @@ python __anonymous() {
               ("opengl", "libgl", "libgl1"),
               ("glvnd", "libglx",),
               ("gles", "libgles1", "libglesv1-cm1"),
-              ("gles", "libgles2", "libglesv2-2"),
-              ("gles", "libgles3",),
+              ("gles", "libgles2", "libglesv2-2", "libgles3"),
               ("opencl", "libopencl",)):
         if not p[0] in pkgconfig:
             continue
@@ -353,8 +344,7 @@ FILES:libgl-mesa-dev = "${libdir}/libGL.* ${includedir}/GL ${libdir}/pkgconfig/g
 FILES:libglx-mesa-dev = "${libdir}/libGLX*.*"
 FILES:libglapi-dev = "${libdir}/libglapi.*"
 FILES:libgles1-mesa-dev = "${libdir}/libGLESv1*.* ${includedir}/GLES ${libdir}/pkgconfig/glesv1*.pc"
-FILES:libgles2-mesa-dev = "${libdir}/libGLESv2.* ${includedir}/GLES2 ${libdir}/pkgconfig/glesv2.pc"
-FILES:libgles3-mesa-dev = "${includedir}/GLES3"
+FILES:libgles2-mesa-dev = "${libdir}/libGLESv2.* ${includedir}/GLES2 ${includedir}/GLES3 ${libdir}/pkgconfig/glesv2.pc"
 FILES:libopencl-mesa-dev = "${libdir}/lib*OpenCL.so"
 FILES:libxatracker-dev = "${libdir}/libxatracker.so ${libdir}/libxatracker.la \
                           ${includedir}/xa_tracker.h ${includedir}/xa_composite.h ${includedir}/xa_context.h \