Collected msysgit build patches for upstream

This set of patches collects a number of build fixes that have been
used on the msysgit port for a while and merging upstream should
simplify future maintenance.

Git for Windows 1.8.3-preview20130601

Git for Windows 1.8.1.2-preview20130201

Git 1.8.0.1

Git for Windows 1.8.0-preview20121122

Git for Windows 1.7.11-preview20120704

Git for Windows 1.7.11-preview20120620

Git 1.7.11-rc1

Git 1.7.10.4

Git 1.7.11-rc0