cmake: skip CA-path/bundle auto-detection in cross-builds

Also remove issue from KNOWN_BUGS.

Reported-by: Cristian Morales Vega
Reviewed-by: Marcel Raad
Fixes #6178
Closes #10676

CMakeLists.txt

@@ -870,7 +870,9 @@ elseif("${CURL_CA_BUNDLE}" STREQUAL "none")
   unset(CURL_CA_BUNDLE CACHE)
 elseif("${CURL_CA_BUNDLE}" STREQUAL "auto")
   unset(CURL_CA_BUNDLE CACHE)
-  set(CURL_CA_BUNDLE_AUTODETECT TRUE)
+  if(NOT CMAKE_CROSSCOMPILING)
+    set(CURL_CA_BUNDLE_AUTODETECT TRUE)
+  endif()
 else()
   set(CURL_CA_BUNDLE_SET TRUE)
 endif()
@@ -881,7 +883,7 @@ elseif("${CURL_CA_PATH}" STREQUAL "none")
   unset(CURL_CA_PATH CACHE)
 elseif("${CURL_CA_PATH}" STREQUAL "auto")
   unset(CURL_CA_PATH CACHE)
-  if(NOT USE_NSS)
+  if(NOT CMAKE_CROSSCOMPILING AND NOT USE_NSS)
     set(CURL_CA_PATH_AUTODETECT TRUE)
   endif()
 else()

docs/KNOWN_BUGS

@@ -107,7 +107,6 @@ problems may have been fixed or changed somewhat since this was written.
  15.6 uses -lpthread instead of Threads::Threads
  15.7 generated .pc file contains strange entries
  15.8 libcurl.pc uses absolute library paths
- 15.9 cert paths autodetected when cross-compiling
  15.10 libpsl is not supported
  15.11 ExternalProject_Add does not set CURL_CA_PATH
  15.12 cannot enable LDAPS on Windows
@@ -684,13 +683,6 @@ problems may have been fixed or changed somewhat since this was written.
 
  See https://github.com/curl/curl/issues/6169
 
-15.9 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
-
 15.10 libpsl is not supported
 
  See https://github.com/curl/curl/issues/6214