python3: bump version to 3.9.7

Refreshed patches.
And apply hack for line-endings in pep517 (from pip).

Hack comment:
  # FIXME: [1] get rid of this asap; 'patch' doesn't like Windows endings, and this file is full of them...
  #        I actually tried this in a number of ways and the only way to fix this is to implement
  #        a poor-man's dos2unix using sed.
  #        The issue is with the pip package; it seems that it throws in some Windows line-endings
  #        and 'patch' won't handle them. So, we do a "dos2unix" and then patch.
  #        We can get rid of this once this is solved upstream and in pip:
  #            https://github.com/pypa/pep517/pull/130

Signed-off-by: Alexandru Ardelean <ardeleanalex@gmail.com>
(cherry picked from commit 26988f905f)

lang/python/python3/patches/006-do-not-add-multiarch-paths-when-cross-compiling.patch

@@ -1,6 +1,6 @@
 --- a/setup.py
 +++ b/setup.py
-@@ -734,7 +734,8 @@ class PyBuildExt(build_ext):
+@@ -737,7 +737,8 @@ class PyBuildExt(build_ext):
          # only change this for cross builds for 3.3, issues on Mageia
          if CROSS_COMPILING:
              self.add_cross_compiling_paths()

lang/python/python3/patches/010-do-not-add-rt-lib-dirs-when-cross-compiling.patch

@@ -1,6 +1,6 @@
 --- a/setup.py
 +++ b/setup.py
-@@ -711,8 +711,9 @@ class PyBuildExt(build_ext):
+@@ -714,8 +714,9 @@ class PyBuildExt(build_ext):
          # directly since an inconsistently reproducible issue comes up where
          # the environment variable is not set even though the value were passed
          # into configure and stored in the Makefile (issue found on OS X 10.3).