Merge #15978: .gitignore: Don't ignore depends patches

a3592c9 .gitignore: Don't ignore depends patches (Carl Dong)

Pull request description:

  Ignoring patches might be useful for those who use `git format-patch` often, but in our depends folder we **_want_** to keep track of our patches.

ACKs for commit a3592c:
  practicalswift:
    utACK a3592c9
  laanwj:
    utACK a3592c9
  jonasschnelli:
    utACK a3592c9
  fanquake:
    utACK a3592c9

Tree-SHA512: 439479cc2ff05335c3d21551a23b34ef2f8a4d0eb05085d2422c2c8d7d7035f529b83dc4056f18cb96234d6fa74075adaa14f0e5fb4c99e6189a4af9078fd28e

Author: MarcoFalke

.gitignore

@@ -62,7 +62,6 @@ src/qt/bitcoin-qt.includes
 *.pyc
 *.o
 *.o-*
-*.patch
 *.a
 *.pb.cc
 *.pb.h
@@ -75,6 +74,10 @@ src/qt/bitcoin-qt.includes
 *.json.h
 *.raw.h
 
+# Only ignore unexpected patches
+*.patch
+!depends/patches/*.patch
+
 #libtool object files
 *.lo
 *.la