CI: Ensure that CMake finds the right OpenSSL libs

Due to this minor oversight, the build script moved the generated artifacts and CMake subsequently failed to find them, silently falling back to the incorrect system-provided version. This then lead to libcurl using the wrong headers because CMake "found" them elsewhere, without realizing the versions didn't match or generating any warnings.

deps/openssl-windowsbuild.sh

@@ -17,5 +17,5 @@ make -j $NUM_PARALLEL_JOBS
 
 cd -
 
-mv $OPENSSL_DIR/libcrypto.a $BUILD_DIR
-mv $OPENSSL_DIR/libssl.a $BUILD_DIR
+cp $OPENSSL_DIR/libcrypto.a $BUILD_DIR
+cp $OPENSSL_DIR/libssl.a $BUILD_DIR