BLD: revert windows repair changes [wheel build]

tools/wheels/cibw_before_build_win.sh

@@ -11,4 +11,4 @@ python -m pip install -r requirements/openblas.txt
 python -c "import scipy_openblas32; print(scipy_openblas32.get_pkg_config())" > $PROJECT_DIR/scipy-openblas.pc
 
 # delvewheel is the equivalent of delocate/auditwheel for windows.
-python -m pip install delvewheel
+python -m pip install delvewheel wheel

tools/wheels/repair_windows.sh

@@ -4,4 +4,27 @@ WHEEL="$1"
 DEST_DIR="$2"
 OPENBLAS_DIR=$(python -c"import scipy_openblas32 as sop; print(sop.get_lib_dir())")
 
+# create a temporary directory in the destination folder and unpack the wheel
+# into there
+pushd $DEST_DIR
+mkdir -p tmp
+pushd tmp
+wheel unpack $WHEEL
+pushd scipy*
+
+# To avoid DLL hell, the file name of libopenblas that's being vendored with
+# the wheel has to be name-mangled. delvewheel is unable to name-mangle PYD
+# containing extra data at the end of the binary, which frequently occurs when
+# building with mingw.
+# We therefore find each PYD in the directory structure and strip them.
+
+for f in $(find ./scipy* -name '*.pyd'); do strip $f; done
+
+# now repack the wheel and overwrite the original
+wheel pack .
+mv -fv *.whl $WHEEL
+
+cd $DEST_DIR
+rm -rf tmp
+
 delvewheel repair --add-path $OPENBLAS_DIR --no-dll libsf_error_state.dll -w $DEST_DIR $WHEEL