Properly delete Node OpenSSL headers after downloading them

tools/run_tests/build_node.bat

@@ -27,4 +27,12 @@
 @rem (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 @rem OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
-npm install --build-from-source
\ No newline at end of file
+call npm install --build-from-source
+
+@rem delete the redundant openssl headers
+for /f "delims=v" %%v in ('node --version') do (
+  rmdir "%HOMEDRIVE%%HOMEPATH%\.node-gyp\%%v\include\node\openssl" /S /Q
+)
+
+@rem rebuild, because it probably failed the first time
+call npm install --build-from-source
\ No newline at end of file

tools/run_tests/pre_build_node.bat

@@ -28,12 +28,5 @@
 @rem OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
 @rem Expire cache after 1 week
-npm update --cache-min 604800
+call npm update --cache-min 604800
 
-npm install node-gyp-install
-.\node_modules\.bin\node-gyp-install.cmd
-
-@rem delete the redundant openssl headers
-for /f "delims=v" %%v in ('node --version') do (
-  rmdir "%HOMEDRIVE%%HOMEPATH%\.node-gyp\%%v\include\node\openssl" /S /Q
-)
\ No newline at end of file