[chirp_devel] Fix issue #2029 - Try to make Cygwin not complain about bash env params

The original changeset 2289:2f60576c5713 added these lines to most scripts where it was previously missing, however, it would appear that changeset 2295:1d3eb2711f91 was necessary to build on Cygwin/Windows.

However, only make_win32_build.sh was corrected by changeset 2295:1d3eb2711f91 and win32_remote_build.sh was left in a maybe not-working state. This patch should remove any potential remaining problems.