gtk-doc: fix relocation

something broke with the last update and there are now backslashes
in the paths. Handle those as well.

mingw-w64-gtk-doc/PKGBUILD

@@ -4,7 +4,7 @@ _realname=gtk-doc
 pkgbase=mingw-w64-${_realname}
 pkgname=("${MINGW_PACKAGE_PREFIX}-${_realname}")
 pkgver=1.34.0
-pkgrel=1
+pkgrel=2
 pkgdesc="Documentation tool for public library API (mingw-w64)"
 arch=('any')
 mingw_arch=('mingw32' 'mingw64' 'ucrt64' 'clang64' 'clang32' 'clangarm64')
@@ -66,7 +66,8 @@ package() {
   done
 
   local _config_data="${pkgdir}${MINGW_PREFIX}/share/gtk-doc/python/gtkdoc/config_data.py"
-  echo -e "import sys\n$(cat "${_config_data}")" > "${_config_data}"
+  sed '1i\import sys' -i  "${_config_data}"
   sed -s "s|'$(cygpath -m ${MINGW_PREFIX})|sys.prefix + '|g" -i "${_config_data}"
+  sed -s "s|'$(cygpath -w ${MINGW_PREFIX}/ | sed 's/\\/\\\\/g')|sys.prefix + '/|g" -i "${_config_data}"
   sed -s "s|'${MINGW_PREFIX}|sys.prefix + '|g" -i "${_config_data}"
 }