Radix cross Linux

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   gpgme-1.15.1-python-cross.patch - set PYTHONPATH, LDSHARED variables for setyp.py script by
                                     user defined environment variable PYTHON_PATH and PYTHON_LDSHARED
                                     like follow:
                                       $ make PYTHON_PATH=path-to-python/lib-dinload \
                                              PYTHON_LDSHARED='path-to-cross-gcc --sysroot=...'
                                     NOTE: that works only with Python3.

                                     Also this patch splits setup.py install arguments
                                        setup.py install \
                                        --root="$(DESTDIR)" \
                                        --install-lib=$(PYTHON_SITE_PKG) \
                                        --prefix="$(prefix)" \
                                     to correctly set Python's site-packages path.

       PYTHON_PATH - path to Python lib-dinload directory where placed the sysconfig file
                     got build machine Python, for example:
                       PYTHON_PATH=PATH_TO_DEVENV_SYSROOT/usr/lib/python3.7/lib-dynload
                     if your build machine is an x86_64 Linux machine then the file:
                       _sysconfigdata_m_linux_x86_64-linux-gnu.py
                     will be used by Python setup tools to get system variables to
                     build extension module. For example the suffix of shared library
                     defined by EXT_SUFFIX variable in the _sysconfigdata_* file.

   PYTHON_LDSHARED - cross linker for Python extension module, for example:
                       /opt/toolchains/ppc64-POWER8-linux-glibc/1.6.4/bin/ppc64-power8-linux-gnu-gcc \
                          --sysroot=PATH_TO_DEVENV_SYSROOT -shared
                     used to define 'LDSHARED' environment variable to build Python extensions.

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