Merge pull request #7824

90d6bed cmake: bodge cmake failure on OSS-Fuzz (moneromooo-monero)

CMakeLists.txt

@@ -234,7 +234,7 @@ add_library(l3 OBJECT incorrect_source.cpp)
     file(REMOVE_RECURSE "${TEST_PROJECT}")
   endforeach()
 endfunction()
-if (NOT (CMAKE_SYSTEM_NAME MATCHES "kOpenBSD.*|OpenBSD.*"))
+if (NOT (CMAKE_SYSTEM_NAME MATCHES "kOpenBSD.*|OpenBSD.*") AND NOT OSSFUZZ)
   forbid_undefined_symbols()
 endif()