VERSION file installed in wrong location since 6.6.1

Description

In OTB 6.6.1 the VERSION file is installed in the wrong location, it used to be installed in the same location as the LICENSE file (${OTB_INSTALL_DOC_DIR}):

-- Installing: /build/otb-6.6.1+dfsg/debian/tmp/usr/share/doc/otb/LICENSE
-- Installing: /build/otb-6.6.1+dfsg/debian/tmp/build/otb-6.6.1+dfsg/obj-x86_64-linux-gnu/share/otb/VERSION

Steps to reproduce

Build OTB 6.6.1 with these CMake flags:

CMAKE_FLAGS = \
        -DBUILD_EXAMPLES:BOOL=OFF \
        -DBUILD_SHARED_LIBS:BOOL=ON \
        -DBUILD_TESTING:BOOL=OFF \
        -DCMAKE_BUILD_TYPE:STRING=Release \
        -DCMAKE_INSTALL_PREFIX=/usr \
        -DCMAKE_SKIP_RPATH:BOOL=ON \
        -DOTB_INSTALL_ARCHIVE_DIR:STRING=lib/$(DEB_HOST_MULTIARCH) \
        -DOTB_INSTALL_LIBRARY_DIR:STRING=lib/$(DEB_HOST_MULTIARCH) \
        -DOTB_USE_6S:BOOL=OFF \
        -DOTB_USE_CURL:BOOL=ON \
        -DOTB_USE_GLEW:BOOL=ON \
        -DOTB_USE_GLFW:BOOL=ON \
        -DOTB_USE_LIBKML:BOOL=ON \
        -DOTB_USE_LIBSVM:BOOL=ON \
        -DOTB_USE_MAPNIK:BOOL=OFF \
        -DOTB_USE_MUPARSER:BOOL=ON \
        -DOTB_USE_MUPARSERX:BOOL=OFF \
        -DOTB_USE_OPENCV:BOOL=ON \
        -DOTB_USE_OPENGL:BOOL=ON \
        -DOTB_USE_QT:BOOL=ON \
        -DOTB_USE_QWT:BOOL=ON \
        -DOTB_WRAP_PYTHON:BOOL=ON \
        -DOTB_WRAP_PYTHON3:BOOL=ON

Configuration information

Debian unstable, OTB 6.6.1.