Introduce a no-pinshared option

This option prevents OpenSSL from pinning itself in memory.

Fixes #7598

[extended tests]

Reviewed-by: Tim Hudson <tjh@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/7647)
diff --git a/Configure b/Configure
index da09003..7a2be83 100755
--- a/Configure
+++ b/Configure
@@ -374,6 +374,7 @@
     "msan",
     "multiblock",
     "nextprotoneg",
+    "pinshared",
     "ocb",
     "ocsp",
     "pic",