selectively depend on rocksdb

Makefile

@@ -179,10 +179,6 @@ ifneq ($(USE_LIBBACKTRACE), 0)
 deps: | libbacktrace
 endif
 
-ifneq ($(USE_SYSTEM_ROCKSDB), 0)
-deps: | rocksdb
-endif
-
 ifneq ($(ENABLE_EVMC), 0)
   NIM_PARAMS += -d:evmc_enabled
   T8N_PARAMS := -d:chronicles_enabled=off
@@ -213,15 +209,10 @@ $(TOOLS): | build deps
 		$(ENV_SCRIPT) nim c $(NIM_PARAMS) -o:build/$@ "$${TOOL_DIR}/$@.nim"
 
 # a phony target, because teaching `make` how to do conditional recompilation of Nim projects is too complicated
-nimbus: | build deps
+nimbus: | build deps rocksdb
 	echo -e $(BUILD_MSG) "build/$@" && \
 		$(ENV_SCRIPT) nim c $(NIM_PARAMS) -d:chronicles_log_level=TRACE -o:build/$@ "nimbus/$@.nim"
 
-nimbus_rocksdb_static: | build deps
-	echo -e $(BUILD_MSG) "build/$@" && \
-		$(ENV_SCRIPT) nim c $(NIM_PARAMS) -d:enable_rocksdb_static_linking -d:chronicles_log_level=TRACE \
-		-o:build/$@ "nimbus/nimbus.nim"
-
 # symlink
 nimbus.nims:
 	ln -s nimbus.nimble $@
@@ -232,20 +223,24 @@ libbacktrace:
 
 # nim-rocksdb
 
+ifneq ($(USE_SYSTEM_ROCKSDB), 0)
 ifeq ($(OS), Windows_NT)
 rocksdb: fetch-dlls
 else
 rocksdb:
 	+ vendor/nim-rocksdb/scripts/build_static_deps.sh
 endif
+else
+rocksdb:
+endif
 
 # builds and runs the nimbus test suite
-test: | build deps
+test: | build deps rocksdb
 	$(ENV_SCRIPT) nim test_rocksdb $(NIM_PARAMS) nimbus.nims
 	$(ENV_SCRIPT) nim test $(NIM_PARAMS) nimbus.nims
 
 # builds and runs an EVM-related subset of the nimbus test suite
-test-evm: | build deps
+test-evm: | build deps rocksdb
 	$(ENV_SCRIPT) nim test_evm $(NIM_PARAMS) nimbus.nims
 
 # Primitive reproducibility test.
@@ -343,7 +338,7 @@ t8n_test: | build deps t8n
 	$(ENV_SCRIPT) nim c -r $(NIM_PARAMS) -d:chronicles_default_output_device=stderr "tools/t8n/$@.nim"
 
 # builds evm state test tool
-evmstate: | build deps
+evmstate: | build deps rocksdb
 	$(ENV_SCRIPT) nim c $(NIM_PARAMS) "tools/evmstate/$@.nim"
 
 # builds and runs evm state tool test suite