Fix paths to .sh scripts

These need to be in Unix form, it appears.

Author: matthew-brett

.github/workflows/build.yml

@@ -55,13 +55,11 @@ jobs:
       - name: Build
         run: |
           git submodule update --init --recursive
-          echo "Var: $env:CHERE_INVOKING"
-          & $env:BASH_PATH -lc pwd
-          & $env:BASH_PATH -lc tools\build_openblas.sh
+          & $env:BASH_PATH -lc tools/build_openblas.sh
 
       - name: Test
         run: |
-          & $env:BASH_PATH -lc tools\build_gfortran.sh
+          & $env:BASH_PATH -lc tools/build_gfortran.sh
           cp test.exe builds
           cp test_dyn.exe builds
           .\test.exe
@@ -77,4 +75,4 @@ jobs:
          OPENBLAS_LIBS_STAGING_UPLOAD_TOKEN: ${{ secrets.MULTIBUILD_WHEELS_STAGING_ACCESS }}
         run: |
           pip install -q git+https://github.com/Anaconda-Platform/[email protected]
-          & $env:BASH_PATH -lc tools\upload_to_anaconda_staging.sh
+          & $env:BASH_PATH -lc tools/upload_to_anaconda_staging.sh