Add support for SHA-384 and SHA-512 hash algorithms

Author: Julien Couvreur

src/Compilers/CSharp/Portable/CSharpResources.resx

@@ -4755,7 +4755,7 @@ To remove the warning, you can use /reference instead (set the Embed Interop Typ
 -baseaddress:<address>        Base address for the library to be built
 -checksumalgorithm:<alg>      Specify algorithm for calculating source file
                               checksum stored in PDB. Supported values are:
-                              SHA1 or SHA256 (default).
+                              SHA1, SHA256 (default), SHA384, or SHA512.
 -codepage:<n>                 Specify the codepage to use when opening source
                               files
 -utf8output                   Output compiler messages in UTF-8 encoding