git: fix i686 `wincred` build
git: fix i686 `wincred` build

It currently fails with:

  cc1.exe: error: CPU you selected does not support x86-64 instruction set

The workaround `CC=gcc` was already used, just not in the correct line;
It was only used in the second line of the pair that tries to make sure
that `wincred` is built using the correct link flags (introduced in
de61e1ad4 (git: build `git-bash.exe`/wincred first, to avoid `* new link
flags` issues, 2018-11-26).

Signed-off-by: Johannes Schindelin <53fb8db7833fca1e1746dd8592f61048d350f64c@gmx.de>

dscho/MINGW-packages,dscho/MINGW-packages,git-for-windows/MINGW-packages,git-for-windows/MINGW-packages,dscho/MINGW-packages,dscho/MINGW-packages,dscho/MINGW-packages,git-for-windows/MINGW-packages