TST: Rebase NumPy dlls before running test in Cygwin CI.

Also fix some bashisms in a couple of scripts.

Author: DWesl

.github/workflows/cygwin.yml

@@ -49,6 +49,9 @@ jobs:
       - name: Install new NumPy
         run: |
           bash -c "/usr/bin/python3.8 -m pip install dist/numpy-*cp38*.whl"
+      - name: Rebase NumPy compiled extensions
+        run: |
+          bash -c "/usr/bin/rebase --database --oblivious `/bin/dash tools/list_numpy_dlls.sh 3.8`"
       - name: Run NumPy test suite
         run: >-
           dash -c "/usr/bin/python3.8 runtests.py -n -vv"

tools/list_installed_dll_dependencies_cygwin.sh

@@ -12,10 +12,7 @@
 # /bin/sh
 
 py_ver=${1}
-site_packages=$(python${py_ver} -m pip show numpy | \
-		    grep Location | cut -d " " -f 2 -);
-dll_list=$(for name in $(python${py_ver} -m pip show -f numpy | \
-			     grep -F .dll); do echo ${site_packages}/${name}; done)
+dll_list=`/bin/dash tools/list_numpy_dlls.sh ${py_ver}`
 echo "Checks for existence, permissions and file type"
 ls -l ${dll_list}
 file ${dll_list}
@@ -29,10 +26,10 @@ cd dist/
 for name in ${dll_list};
 do
     echo ${name}
-    ext_module=$(echo ${name} | \
+    ext_module=`echo ${name} | \
                      sed -E \
 			 -e "s/^\/+(home|usr).*?site-packages\/+//" \
 			 -e "s/.cpython-3.m?-x86(_64)?-cygwin.dll$//" \
-			 -e "s/\//./g")
+			 -e "s/\//./g"`
     python${py_ver} -c "import ${ext_module}"
 done

tools/list_numpy_dlls.sh

@@ -0,0 +1,9 @@
+#!/bin/dash
+# Print the list of dlls installed by NumPy
+
+py_ver=${1}
+site_packages=`python${py_ver} -m pip show numpy | \
+		    grep Location | cut -d " " -f 2 -`;
+dll_list=`for name in $(python${py_ver} -m pip show -f numpy | \
+			     grep -F .dll); do echo ${site_packages}/${name}; done`
+echo ${dll_list}