evas: Fix distcheck by disabling shaders generation

make distcheck is verified by checking the env var "top_distdir"
This is not a great solution but should work.

src/modules/evas/engines/gl_common/shader/gen_shaders.sh

@@ -3,9 +3,16 @@
 # This script will generate a C file containing all the shaders used by Evas
 
 DIR=`dirname $0`
+cd $DIR/../../../../../
 
 OUTPUT="$DIR/evas_gl_shaders.x"
 
+# Skip generation during make distcheck
+if [ "${top_distdir}" != "" ] ; then exit 0; fi
+
+# Skip generation if file can not be written to
+if [ ! -w ${OUTPUT} ] ; then exit 0; fi
+
 # Skip generation if there is no diff (or no git)
 if ! git rev-parse 2>> /dev/null >> /dev/null ; then exit 0 ; fi
 if git diff --quiet --exit-code -- "$DIR"

src/modules/evas/engines/gl_common/shader_3d/gen_shaders_3d.sh

@@ -7,6 +7,12 @@ cd $DIR/../../../../../
 
 OUTPUT="$DIR/evas_gl_3d_shaders.x"
 
+# Skip generation during make distcheck
+if [ "${top_distdir}" != "" ] ; then exit 0; fi
+
+# Skip generation if file can not be written to
+if [ ! -w ${OUTPUT} ] ; then exit 0; fi
+
 # Skip generation if there is no diff (or no git)
 if ! git rev-parse 2>> /dev/null >> /dev/null ; then exit 0 ; fi
 if git diff --quiet --exit-code -- "$DIR"