Fix shared library tests for Windows (#1074)

Add copying of shared library to the output directory with a test binary.

[binary] removed using of non unsigned char as argument at
'std::isspace' function that was provokes undefined behavior.

[.github/workflows/build.yml] enabled run of test at the
'windows-latest' environment.

.github/workflows/build.yml

@@ -33,7 +33,7 @@ jobs:
             cmake --build . --parallel 4
 
           # tests are failing for unknown reasons
-        - if: matrix.os == 'ubuntu-latest'
+        - if: matrix.os != 'macos-latest'
           name: Test shared
           shell: bash
           run: cd build && ctest --output-on-failure