remove_mono: breaks dotnet40 on subsequent dotnet* installs (#2101)

We should not be removing mscoree.dll in all dotnet* installs because
it could have been placed by the dotnet40 verb, which would cause
subsequent dotnet* verbs to break dotnet40. The deletion should
instead only happen when the native dotnet is detected. We continue
to remove the registry keys in any case, though, since they are
only relevant to the native DLL.

Closes #2072

src/winetricks

@@ -18904,18 +18904,17 @@ load_remove_mono()
         for uuid in ${mono_uuid}; do
             "${WINE_ARCH}" uninstaller --remove "${uuid}"
         done
+        "${WINE_ARCH}" reg delete "HKLM\\Software\\Microsoft\\NET Framework Setup\\NDP\\v3.5" /f || true
+        "${WINE_ARCH}" reg delete "HKLM\\Software\\Microsoft\\NET Framework Setup\\NDP\\v4" /f || true
+
+        if grep --quiet --text "WINE_MONO_OVERRIDES" "${W_WINDIR_UNIX}/system32/mscoree.dll"; then
+            w_try rm -f "${W_WINDIR_UNIX}/system32/mscoree.dll"
+        fi
+        if grep --quiet --text "WINE_MONO_OVERRIDES" "${W_WINDIR_UNIX}/syswow64/mscoree.dll"; then
+            w_try rm -f "${W_WINDIR_UNIX}/syswow64/mscoree.dll"
+        fi
     elif [ -z "$1" ] || [ "$1" != "internal" ]; then
-        # Bail out if mono isn't installed, so we don't break .Net setups
         w_warn "Mono does not appear to be installed."
-        return
-    fi
-
-    "${WINE_ARCH}" reg delete "HKLM\\Software\\Microsoft\\NET Framework Setup\\NDP\\v3.5" /f || true
-    "${WINE_ARCH}" reg delete "HKLM\\Software\\Microsoft\\NET Framework Setup\\NDP\\v4" /f || true
-
-    w_try rm -f "${W_WINDIR_UNIX}/system32/mscoree.dll"
-    if [ "${W_ARCH}" = "win64" ]; then
-        w_try rm -f "${W_WINDIR_UNIX}/syswow64/mscoree.dll"
     fi
 }