Update lang/c++/build.sh

Co-authored-by: Martin Grigorov <martin-g@users.noreply.github.com>

Author: Fokko

lang/c++/build.sh

@@ -58,7 +58,7 @@ function do_doc() {
 function do_dist() {
   rm -rf $BUILD_CPP/
   mkdir -p $BUILD_CPP
-  cp -r include/avro AUTHORS build.sh CMakeLists.txt ChangeLog \
+  cp -r include AUTHORS build.sh CMakeLists.txt ChangeLog \
     LICENSE NOTICE impl jsonschemas NEWS README test examples \
     $BUILD_CPP
   find $BUILD_CPP -name '.svn' | xargs rm -rf