[ESI] Not every build has zlib (#6356)

Fixes Windows build

test/Dialect/ESI/manifest.mlir

@@ -1,3 +1,4 @@
+// REQUIRES: zlib
 // RUN: circt-opt %s --esi-connect-services --esi-appid-hier=top=top --esi-build-manifest="top=top to-file=%t1.json" | circt-opt | FileCheck --check-prefix=HIER %s
 // RUN: FileCheck --input-file=%t1.json %s
 

test/lit.cfg.py

@@ -71,6 +71,9 @@ if config.verilator_path != "":
 if config.esi_capnp != "":
   config.available_features.add('capnp')
 
+if config.zlib == "1":
+  config.available_features.add('zlib')
+
 # Enable tests for schedulers relying on an external solver from OR-Tools.
 if config.scheduling_or_tools != "":
   config.available_features.add('or-tools')

test/lit.site.cfg.py.in

@@ -37,6 +37,7 @@ config.circt_tools_dir = "@CIRCT_TOOLS_DIR@"
 config.circt_shlib_dir = "@LLVM_LIBRARY_OUTPUT_INTDIR@"
 config.verilator_path = "@VERILATOR_PATH@"
 config.esi_capnp = "@ESI_CAPNP@"
+config.zlib = "@HAVE_ZLIB@"
 config.scheduling_or_tools = "@SCHEDULING_OR_TOOLS@"
 config.llhd_sim_enabled = @CIRCT_LLHD_SIM_ENABLED@