license: add gcc license files (for MinGW64)

Author: oscarbenjamin

pyproject.toml

@@ -157,9 +157,12 @@ repair-wheel-command = [
     --license-file .local/src/flint-*/COPYING.LESSER:python-flint.libs/flint-*/COPYING.LESSER \
     \
     --license "MIT AND BSD-3-Clause-Clear" \
-    --license-file wheels/winpthread_COPYING:python-flint.libs/winpthreads/COPYING \
+    --license-file wheels/winpthread/COPYING:python-flint.libs/winpthreads/COPYING \
     \
     --license "GPL-3.0-or-later WITH GCC-exception-3.1 AND LGPL-2.1-or-later" \
+    --license-file wheels/gcc/COPYING3:python-flint.libs/gcc/COPYING3 \
+    --license-file wheels/gcc/COPYING.LIB:python-flint.libs/gcc/COPYING.LIB \
+    --license-file wheels/gcc/COPYING.RUNTIME:python-flint.libs/gcc/COPYING.RUNTIME \
 """,
 # Need license file for libgcc_s_seh-1.dll
 "delvewheel repair -w {dest_dir} {wheel} --add-path .local/bin",