Add loongarch64 target

Reviewed-by: Todd Short <todd.short@me.com>
Reviewed-by: Paul Dale <pauli@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/17712)
diff --git a/Configurations/10-main.conf b/Configurations/10-main.conf
index ba224fb..9368cf6 100644
--- a/Configurations/10-main.conf
+++ b/Configurations/10-main.conf
@@ -818,6 +818,13 @@
         perlasm_scheme   => "linux64",
     },
 
+    # loongarch64 below refers to contemporary LOONGARCH Architecture
+    # specifications,
+    "linux64-loongarch64" => {
+        inherit_from     => [ "linux-generic64"],
+        perlasm_scheme   => "linux64",
+    },
+
     #### IA-32 targets...
     #### These two targets are a bit aged and are to be used on older Linux
     #### machines where gcc doesn't understand -m32 and -m64