net-installer: initialize MINGW/MSYS2 packages and build-extra repos

When working on Git for Windows, we need to (re-)build the packages
listed in the MINGW-packages, MSYS2-packages and build-extra
repositories.

So let's just initialize the respective repositories in /usr/src/, but
to save bandwidth for net installer users who just want to build Git,
let's not fetch anything yet. Users who do want to build packages can
easily issue commands like the following:

	cd /usr/src/build-extra
	git fetch origin
	git checkout master

When building those packages, Pacman really insists on Unix line endings
in the PKGBUILD files. However, our default for core.autocrlf is "true".
Therefore we need to set that flag to "false" explictly for those
repositories.

Signed-off-by: Johannes Schindelin <[email protected]>

Author: dscho

net-installer/setup-git-sdk.bat

@@ -75,6 +75,6 @@
 @bash --login -c 'SHORTCUT="$HOME/Desktop/Git SDK @@BITNESS@@-bit.lnk"; test -f "$SHORTCUT" ^|^| create-shortcut.exe --icon-file /msys2.ico --work-dir / /mingw@@BITNESS@@_shell.bat "$SHORTCUT"'
 
 @REM now clone the Git sources, build it, and start an interactive shell
-@mintty -i /msys2.ico bash --login -c "mkdir -p /usr/src && cd /usr/src && git clone -b @@GIT_BRANCH@@ -c core.autocrlf=false https://github.com/git-for-windows/git && cd git && make install; bash --login -i"
+@mintty -i /msys2.ico bash --login -c "mkdir -p /usr/src && cd /usr/src && for project in MINGW-packages MSYS2-packages build-extra; do mkdir -p $project && (cd $project && git init && git config core.autocrlf false && git remote add origin https://github.com/git-for-windows/$project); done; git clone -b @@GIT_BRANCH@@ -c core.autocrlf=false https://github.com/git-for-windows/git && cd git && make install; bash --login -i"
 
 @IF ERRORLEVEL 1 PAUSE