Wine iexplore.exe triggers a certificate issue when it should not

Reproduction steps

• make sure you have Gecko 2.40 installed, either 2nd stage or from rapps
• open iexplore.exe and browse to the following URL
• https://librecad.org/donate.html

Expected result
we should not get a certificate issue. I just tested that on WinXPSP3
with MyPal28-browser (brings its own crypto-stuff)
with Chromium 49 which uses MS schannel
with Opera 12.18 (brings its own crypto-stuff)

Observed result
Wine iexplore.exe triggers a certificate issue, although we just some days/weeks ago had a roots-CA-update
0.4.15-dev-3235-g6b5ffa7_gcc8_4_0_dbg_win_affected.webm
0.4.15-dev-3235-g6b5ffa7_gcc8_4_0_dbg_win_affected.log
0.4.14-RC-102-gd186a9f gcc 4.7.2 dbg lin ftr shows the same glitch