build,win: pass --debug-nghttp2 to configure

PR-URL: #45209
Reviewed-By: Richard Lau <rlau@redhat.com>
Reviewed-By: Rafael Gonzaga <rafael.nunu@hotmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Yagiz Nizipli <yagiz@nizipli.com>

vcbuild.bat

@@ -201,6 +201,7 @@ if defined link_module      set configure_flags=%configure_flags% %link_module%
 if defined i18n_arg         set configure_flags=%configure_flags% --with-intl=%i18n_arg%
 if defined config_flags     set configure_flags=%configure_flags% %config_flags%
 if defined target_arch      set configure_flags=%configure_flags% --dest-cpu=%target_arch%
+if defined debug_nghttp2    set configure_flags=%configure_flags% --debug-nghttp2
 if defined openssl_no_asm   set configure_flags=%configure_flags% --openssl-no-asm
 if defined DEBUG_HELPER     set configure_flags=%configure_flags% --verbose
 if "%target_arch%"=="x86" if "%PROCESSOR_ARCHITECTURE%"=="AMD64" set configure_flags=%configure_flags% --no-cross-compiling