Disable simd on bitvec dependency

This should hopefully make errors like the following go away (until we have the linker/loader for w32 fixed for c++ dependencies):

```
008c:err:setupapi:SetupDefaultQueueCallbackW copy error 1812 L"@C:\\windows\\system32\\drivers\\wineusb.sys,-1" -> L"C:\\windows\\inf\\wineusb.inf"
wine: failed to open L"C:\\windows\\syswow64\\rundll32.exe": c0000135
wine: configuration in L"/build" has been updated.
Listening on port 7200
iserv-proxy-interpreter.exe:|/nix/store/wi52hmyajdncvx8yhkyrwc6phq0cj3dw-bitv
ec-lib-bitvec-x86_64-w64-mingw32-1.1.5.0/lib/x86_64-windows-ghc-9.6.4/bitvec-1.1
.5.0-CuwZlpVmbRn6Ve35hpelj8/HSbitvec-1.1.5.0-CuwZlpVmbRn6Ve35hpelj8.o:unknown s
ymbol`__cpu_model'
iserv-proxy-interpreter.exe:CouldnotloadObjectCode/nix/store/wi52hmyajdncv
x8yhkyrwc6phq0cj3dw-bitvec-lib-bitvec-x86_64-w64-mingw32-1.1.5.0/lib/x86_64-wind
ows-ghc-9.6.4/bitvec-1.1.5.0-CuwZlpVmbRn6Ve35hpelj8/HSbitvec-1.1.5.0-CuwZlpVmbRn
6Ve35hpelj8.o.


<no location info>: error: unable to load unit `bitvec-1.1.5.0'
[ 17 of 186] Compiling PlutusCore.Pretty.ConfigName ( plutus-core/src/PlutusCore/Pretty/ConfigName.hs, dist/build/PlutusCore/Pretty/ConfigName.o )
[ 18 of 186] Compiling PlutusPrelude    ( prelude/PlutusPrelude.hs, dist/build/PlutusPrelude.o )
[ 19 of 186] Compiling PlutusCore.Version ( plutus-core/src/PlutusCore/Version.hs, dist/build/PlutusCore/Version.o )
0024:err:seh:call_stack_handlers invalid frame 00007FFFFF662F60 (0000000000022000-0000000000220000)
0024:err:seh:NtRaiseException Exception frame is not in stack limits => unable to dispatch exception.
iserv-proxy: {handle: <socket: 6>}: GHCi.Message.remoteCall: end of file

<no location info>: error: ghc-iserv terminated (1)
```

cabal.project

@@ -28,6 +28,11 @@ package cryptonite
   -- generation is dubious. Set the flag so we use /dev/urandom by default.
   flags: -support_rdrand
 
+-- disable c++ nonsense on bitvec, to make it compile. The windows linker/loader
+-- chokes on c++ dependencies.
+package bitvec
+   flags: -simd
+
 constraints:
   -- io-classes-mtl-0.1.2.0 is not buildable
   io-classes-mtl < 0.1.2.0