KNOWN_BUGS: cmake autodetects cert paths when cross-compiling

Closes #6178

docs/KNOWN_BUGS

@@ -130,6 +130,7 @@ problems may have been fixed or changed somewhat since this was written!
  15.7 generated .pc file contains strange entries
  15.8 libcurl.pc uses absolute library paths
  15.9 doesn't fail if zlib support is requested but not found
+ 15.10 cert paths autodetected when cross-compiling
 
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@@ -888,3 +889,10 @@ problems may have been fixed or changed somewhat since this was written!
 15.9 doesn't fail if zlib support is requested but not found
 
  See https://github.com/curl/curl/issues/6173
+
+15.10 cert paths autodetected when cross-compiling
+
+ The autotools build disables the ca_path/ca_bundle detection when
+ cross-compiling. The cmake build keeps doing the detection.
+
+ See https://github.com/curl/curl/issues/6178