Cardano Updates

ouroboros-consensus depends on cardano-lmdb which requires the lmdb
system library (pkg-config: lmdb>=0.9 && <0.10). Since UTxO-HD was
integrated in Cardano Node 10.4.1, lmdb is required for all Cardano
development.

Adds lmdb to dynamic shells and static-lmdb (static-only build via
Makefile ILIBS patching, matching nixpkgs isStatic pattern) to static
shells. The wrapped-cabal in static.nix gets the corresponding -L flag
so GHC finds the static library.

Closes #218
Supersedes #221

GNU config.sub normalises to "aarch64-apple-darwin" while Apple's
LLVM toolchain (and nix cc-wrapper's @defaultTarget@) uses
"arm64-apple-darwin". Older GHC versions pass --target=aarch64-apple-darwin
which triggers a noisy warning from the cc-wrapper's
add-clang-cc-cflags-before hook on every compiler invocation.

The warning is harmless — clang handles both triples identically — but
it pollutes stderr and causes thousands of GHC testsuite failures due
to unexpected compiler output.

Set NIX_CC_WRAPPER_SUPPRESS_TARGET_WARNING=1 in the env script before
sourcing stdenv/setup to suppress this warning.

Signed-off-by: Chris Guiney <[email protected]>

Signed-off-by: Chris Guiney <[email protected]>

Signed-off-by: Chris Guiney <[email protected]>

Signed-off-by: Chris Guiney <[email protected]>

Signed-off-by: Chris Gianelloni <[email protected]>

Signed-off-by: Chris Guiney <[email protected]>

Signed-off-by: Chris Guiney <[email protected]>

Signed-off-by: Chris Guiney <[email protected]>

Signed-off-by: Chris Guiney <[email protected]>

GNU config.sub normalises to "aarch64-apple-darwin" while Apple's
LLVM toolchain (and nix cc-wrapper's @defaultTarget@) uses
"arm64-apple-darwin". Older GHC versions pass --target=aarch64-apple-darwin
which triggers a noisy warning from the cc-wrapper's
add-clang-cc-cflags-before hook on every compiler invocation.

The warning is harmless — clang handles both triples identically — but
it pollutes stderr and causes thousands of GHC testsuite failures due
to unexpected compiler output.

Set NIX_CC_WRAPPER_SUPPRESS_TARGET_WARNING=1 in the env script before
sourcing stdenv/setup to suppress this warning.