fix for vcpkg build

Author: JacobBarthelmeh

CMakeLists.txt

@@ -431,7 +431,9 @@ elseif (WITH_WOLFSSL_TREE)
     set(WOLFCRYPT_AVAILABLE ON)
 else()
     find_package(PkgConfig)
-    pkg_check_modules(WOLFSSL wolfssl)
+    if(PkgConfig_FOUND)
+        pkg_check_modules(WOLFSSL wolfssl)
+    endif()
 
     if (WOLFSSL_FOUND)
         target_link_libraries(wolftpm_wolfssl_dep INTERFACE ${WOLFSSL_LIBRARIES})
@@ -742,7 +744,7 @@ if(BUILD_WOLFTPM_LIB)
     # time to share wolfSSL include/link settings. It is intentionally NOT
     # installed/exported — downstream `find_package(wolftpm)` should only
     # see the real wolftpm target and discover wolfSSL via its own config.
-    install(TARGETS wolftpm
+    install(TARGETS wolftpm wolftpm_wolfssl_dep
             EXPORT  wolftpm-targets
             LIBRARY DESTINATION lib
             ARCHIVE DESTINATION lib