Fix hang-up issue

A single wine invocation may spawn several long-living Win32 processes automatically.
These processes will inherit at least the stderr handle of current wine command and keep it open.
Waiting for the wine command's stderr will hang, e.g. CMake waits for the compilation commands:
https://gitlab.kitware.com/cmake/cmake/-/blob/0991023c30ed5b83bcb1446b5bcc9c1eae028835/Source/kwsys/ProcessUNIX.c#L1076

Fixes #47

wrappers/wine-msvc.bat

@@ -0,0 +1,3 @@
+@echo off
+
+%* %WINE_MSVC_ARGS% > %WINE_MSVC_STDOUT% 2> %WINE_MSVC_STDERR%

wrappers/wine-msvc.sh

@@ -38,5 +38,12 @@ while [ $# -gt 0 ]; do
 	ARGS+=("$a")
 	shift
 done
-WINEDEBUG=-all wine64 "$EXE" "${ARGS[@]}" 2> >(sed 's/\r//' | sed 's/z:\([\\/]\)/\1/i' | sed '/^Note:/s,\\,/,g' >&2) | sed 's/\r//' | sed 's/z:\([\\/]\)/\1/i' | sed '/^Note:/s,\\,/,g'
-exit $PIPESTATUS
+
+unixify_path='s/\r// ; s/z:\([\\/]\)/\1/i ; /^Note:/s,\\,/,g'
+exec {fd1}> >(sed -e "$unixify_path")
+exec {fd2}> >(sed -e "$unixify_path" >&2)
+
+export WINE_MSVC_STDOUT=/proc/$$/fd/$fd1
+export WINE_MSVC_STDERR=/proc/$$/fd/$fd2
+export WINE_MSVC_ARGS=$(printf ' "%s"' "${ARGS[@]}")
+WINEDEBUG=-all wine64 'C:\Windows\System32\cmd.exe' /C $(dirname $0)/wine-msvc.bat "$EXE" &>/dev/null {fd1}>&- {fd2}>&-