Update MSYS2 instructions

`pacman -S` by default reinstalls (and redownloads if necessary) packages given as arguments. Adding `--needed` flag makes it skip packages which are already installed and up to date.
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Mateusz Mikuła authored and Martin Storsjö committed 2020-04-14 13:25:15 +03:00
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@@ -59,7 +59,7 @@ each project for the new configure options to be taken into use.
Building in MSYS2
-----------------
To build in MSYS2, install the following set of packages with `pacman -S`:
To build in MSYS2, install the following set of packages with `pacman -S --needed`:
git subversion mingw-w64-x86_64-gcc mingw-w64-x86_64-ninja mingw-w64-x86_64-cmake make mingw-w64-x86_64-python3