mypy: fixed mypyc command

mingw-w64-mypy/PKGBUILD

@@ -4,7 +4,7 @@ _realname=mypy
 pkgbase=mingw-w64-${_realname}
 pkgname=("${MINGW_PACKAGE_PREFIX}-${_realname}")
 pkgver=0.812
-pkgrel=1
+pkgrel=2
 pkgdesc="Optional static typing for Python 2 and 3 (PEP484) (mingw-w64)"
 arch=('any')
 url="http://www.mypy-lang.org/"
@@ -42,5 +42,6 @@ package() {
     sed -e '1 { s/^#!.*$// }' -i ${_f}
   done
 
-  sed -e '1 { s/^#!.*$// }' -i "${pkgdir}${MINGW_PREFIX}/bin/mypyc"
+  local _PREFIX_WIN=$(cygpath -m ${MINGW_PREFIX})
+  sed -s "s|${_PREFIX_WIN}/bin/||g" -i "${pkgdir}${MINGW_PREFIX}/bin/mypyc"
 }