Ensure that stderr is appearing in the GitHub actions output.

Author: Sedeniono

.github/workflows/test_clang_win.yml

@@ -44,4 +44,4 @@ jobs:
         ADDITIONAL_FLAGS: ${{ format('-std={0} {1}', matrix.cpp_version, matrix.buildmode) }}
         OUT_DIR_NAME: win_clang_generic
       run: |
-        & ".\make_win_gcclike.ps1"
+        & ".\make_win_gcclike.ps1" 2>&1

.github/workflows/test_gcc_win.yml

@@ -43,4 +43,4 @@ jobs:
         CXX: g++
         ADDITIONAL_FLAGS: ${{ format('-Wa,-mbig-obj  -std={0} {1}', matrix.cpp_version, matrix.buildmode) }}
         IS_MSYS: 1
-      run: make generic
+      run: make generic 2>&1