Rationalize GLES2/3 .in files.

We weren't using gl2_api.in, since gl3_api.in was a superset. And
gl3ext_api.in was empty, and Khronos has decided to keep it that way
(any GLES2/3/... extensions will be in gl2ext.h).

Since libGLES2.so will have all future backwards-compatible GLES APIs,
it makes sense to just use gl2_api.in and gl2ext_api.in to build its
contents. This changes renames gl3_api.in to gl2_api.in and updates
uses of it, and removes gl3ext_api.in and references.

Bug: 15028495
Change-Id: I0745eda27ec91ee625f03e957e4fdb22035dd781
diff --git a/opengl/libs/tools/genfiles b/opengl/libs/tools/genfiles
index f92c9ab..a4a1958 100755
--- a/opengl/libs/tools/genfiles
+++ b/opengl/libs/tools/genfiles
@@ -20,17 +20,13 @@
 
 ./glapigen ../../include/GLES/gl.h      > ../GLES_CM/gl_api.in
 ./glapigen ../../include/GLES/glext.h   > ../GLES_CM/glext_api.in
-./glapigen ../../include/GLES2/gl2.h    > ../GLES2/gl2_api.in
+./glapigen ../../include/GLES3/gl3.h    > ../GLES2/gl2_api.in
 ./glapigen ../../include/GLES2/gl2ext.h > ../GLES2/gl2ext_api.in
-./glapigen ../../include/GLES3/gl3.h    > ../GLES2/gl3_api.in
-./glapigen ../../include/GLES3/gl3ext.h > ../GLES2/gl3ext_api.in
 
 ./glentrygen ../../include/GLES/gl.h      > /tmp/gl_entries.in
 ./glentrygen ../../include/GLES/glext.h   > /tmp/glext_entries.in
-./glentrygen ../../include/GLES2/gl2.h    > /tmp/gl2_entries.in
+./glentrygen ../../include/GLES3/gl3.h    > /tmp/gl2_entries.in
 ./glentrygen ../../include/GLES2/gl2ext.h > /tmp/gl2ext_entries.in
-./glentrygen ../../include/GLES3/gl3.h    > /tmp/gl3_entries.in
-./glentrygen ../../include/GLES3/gl3ext.h > /tmp/gl3ext_entries.in
 
 # The awk command removes lines with the same function name as an earlier
 # line, even if the rest of the line differs. Although signatures of
@@ -40,8 +36,6 @@
     /tmp/glext_entries.in \
     /tmp/gl2_entries.in \
     /tmp/gl2ext_entries.in \
-    /tmp/gl3_entries.in \
-    /tmp/gl3ext_entries.in \
         | sort -t, -k2 \
         | awk -F, '!_[$2]++' \
             > ../entries.in
@@ -50,10 +44,8 @@
 
 cat ../../include/GLES/gl.h \
     ../../include/GLES/glext.h \
-    ../../include/GLES2/gl2.h \
     ../../include/GLES2/gl2ext.h \
     ../../include/GLES3/gl3.h \
-    ../../include/GLES3/gl3ext.h \
         | ./glenumsgen \
         | sort \
         > ../enums.in