depends: add NO_HARDEN option

Add an option that when passed, will disable hardening options, and
pass `--disable-hardening` through to configure. Due to the way
we link libssp for Windows builds, they now fail (after #27118),
if building with depends, and configuring with --disable-hardening.
See:
https://github.com/bitcoin/bitcoin/pull/27118#issuecomment-1492606272.

This change would add a depends opiton such that, if someone wants to
build with, for windows, without hardening, they can do so. This may
also be useful when building for debugging.

depends/README.md

@@ -123,6 +123,7 @@ The following can be set when running make: `make FOO=bar`
   resides in the `depends` directory, and the log file is printed out automatically in case
   of build error. After successful build log files are moved along with package archives
 - `LTO`: Use LTO when building packages.
+- `NO_HARDEN=1`: Don't use hardening options when building packages
 
 If some packages are not built, for example `make NO_WALLET=1`, the appropriate
 options will be passed to bitcoin's configure. In this case, `--disable-wallet`.