fix windows build

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cmake/CodeCoverage.cmake

@@ -136,6 +136,18 @@
 include(CMakeParseArguments)
 
 option(CODE_COVERAGE_VERBOSE "Verbose information" FALSE)
+option(SKIP_CODE_COVERAGE "Skip code coverage" OFF)
+
+if (SKIP_CODE_COVERAGE)
+    return()
+endif()
+
+find_library(covlib NAMES gcov lcov)
+message(STATUS "covlib: >${covlib}<")
+if (${covlib} STREQUAL "covlib-NOTFOUND")
+  message(STATUS "lcov or gcov libraries not found, skipping code coverage.")
+  return()
+endif()
 
 # Check prereqs
 find_program( GCOV_PATH gcov )