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Do not adjust the shebang of Python scripts for cross-compilation

The copy_scripts() method in distutils copies the scripts listed in
the setup file and adjusts the first line to refer to the current
Python interpreter. When cross-compiling, this means that the adjusted
shebang refers to the host Python interpreter.

This patch modifies copy_scripts() to preserve the shebang when
cross-compilation is detected.

Signed-off-by: Christophe Vu-Brugier <cvubrugier@fastmail.fm>

Index: b/Lib/distutils/command/build_scripts.py
===================================================================
--- a/Lib/distutils/command/build_scripts.py
+++ b/Lib/distutils/command/build_scripts.py
@@ -91,7 +91,7 @@
                     adjust = True
                     post_interp = match.group(1) or b''
 
-            if adjust:
+            if adjust and not '_python_sysroot' in os.environ:
                 log.info("copying and adjusting %s -> %s", script,
                          self.build_dir)
                 updated_files.append(outfile)
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