Fix .gitignore policy in build_msvc directory #18108

1. 
   hebasto commented at 4:55 PM on February 10, 2020: member

   This PR makes git to ignore only auto-generated .vcxproj files, i.e.: https://github.com/bitcoin/bitcoin/blob/4c2578706c70148fc001f42a0918a2fb10252b43/build_msvc/msvc-autogen.py#L14-L25

   Fix #17287

2. Specify ignored bitcoin-qt file precisely

   This commit prevents ignoring the build_msvc/bitcoin-qt directory.

   79c811ca2b
3. Ignore only auto-generated .vcxproj files dcb7af053d
4. hebasto requested review from fanquake on Feb 10, 2020
5. hebasto requested review from sipsorcery on Feb 10, 2020
6. fanquake added the label Windows on Feb 10, 2020
7. sipsorcery approved
8. 
   sipsorcery commented at 5:57 PM on February 15, 2020: member

   ACK dcb7af053da8f4ce479db7e776802cea26e84434.

9. MarcoFalke referenced this in commit 2a2631fb0d on Feb 15, 2020
10. MarcoFalke merged this on Feb 15, 2020
11. MarcoFalke closed this on Feb 15, 2020

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12. hebasto deleted the branch on Feb 15, 2020
13. 
    gwillen commented at 11:39 PM on February 15, 2020: contributor

    Hooray, as a non-Windows dev who tripped over this when making a change that impacted the Windows build, thanks.

14. MarkLTZ referenced this in commit 8823f65197 on Apr 7, 2020
15. MarkLTZ referenced this in commit 0a1571d657 on Apr 7, 2020
16. DrahtBot locked this on Feb 15, 2022

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