Merge #13750: depends: use MacOS friendly sed syntax in qt.mk

12c93cb depends: use MacOS friendly sed syntax in qt.mk (Sjors Provoost)

Pull request description:

  I just got this error on master:
  ```
  make clean-all
  make -j5
  [...]
  /bitcoin/depends/sources/qttools-opensource-src-5.9.6.tar.xz: OK
  Preprocessing qt...
  sed: 1: "qtbase/mkspecs/bitcoin- ...": extra characters at the end of q command
  make: *** /bitcoin/depends/work/build/x86_64-apple-darwin17.7.0/qt/5.9.6-b48df1b490b/.stamp_preprocessed] Error 1
  ```

Tree-SHA512: 1eaee535c0d637a67801c7dd48e9cd5a037823f4e162a6f50e375787045fdb95929f409a88c7d000d8781a4edc497b5ccb1fd23a24e29324ec633157fadd371e

Author: MarcoFalke

depends/packages/qt.mk

@@ -129,7 +129,7 @@ define $(package)_preprocess_cmds
   cp -f qtbase/mkspecs/macx-clang/qplatformdefs.h qtbase/mkspecs/macx-clang-linux/ &&\
   cp -f $($(package)_patch_dir)/mac-qmake.conf qtbase/mkspecs/macx-clang-linux/qmake.conf && \
   cp -r qtbase/mkspecs/linux-arm-gnueabi-g++ qtbase/mkspecs/bitcoin-linux-g++ && \
-  sed -i s/arm-linux-gnueabi-/$(host)-/g qtbase/mkspecs/bitcoin-linux-g++/qmake.conf && \
+  sed -i.old "s/arm-linux-gnueabi-/$(host)-/g" qtbase/mkspecs/bitcoin-linux-g++/qmake.conf && \
   patch -p1 -i $($(package)_patch_dir)/fix_qt_pkgconfig.patch &&\
   patch -p1 -i $($(package)_patch_dir)/fix_configure_mac.patch &&\
   patch -p1 -i $($(package)_patch_dir)/fix_no_printer.patch &&\