fix: Makefile rocksdb (backport #15422) (#15525)

Co-authored-by: Robert Zaremba <robert@zaremba.ch>

Makefile

@@ -15,9 +15,6 @@ DOCKER := $(shell which docker)
 DOCKER_BUF := $(DOCKER) run --rm -v $(CURDIR):/workspace --workdir /workspace bufbuild/buf:1.0.0-rc8
 PROJECT_NAME = $(shell git remote get-url origin | xargs basename -s .git)
 DOCS_DOMAIN=docs.cosmos.network
-# RocksDB is a native dependency, so we don't assume the library is installed.
-# Instead, it must be explicitly enabled and we warn when it is not.
-ENABLE_ROCKSDB ?= false
 
 export GO111MODULE = on
 
@@ -63,33 +60,23 @@ ldflags = -X github.com/cosmos/cosmos-sdk/version.Name=sim \
 		  -X github.com/cosmos/cosmos-sdk/version.Version=$(VERSION) \
 		  -X github.com/cosmos/cosmos-sdk/version.Commit=$(COMMIT) \
 		  -X "github.com/cosmos/cosmos-sdk/version.BuildTags=$(build_tags_comma_sep)" \
-			-X github.com/tendermint/tendermint/version.TMCoreSemVer=$(TMVERSION)
-
-ifeq ($(ENABLE_ROCKSDB),true)
-  BUILD_TAGS += rocksdb_build
-  test_tags += rocksdb_build
-else
-  $(warning RocksDB support is disabled; to build and test with RocksDB support, set ENABLE_ROCKSDB=true)
-endif
+		  -X github.com/tendermint/tendermint/version.TMCoreSemVer=$(TMVERSION)
 
 # DB backend selection
 ifeq (cleveldb,$(findstring cleveldb,$(COSMOS_BUILD_OPTIONS)))
   build_tags += gcc
 endif
 ifeq (badgerdb,$(findstring badgerdb,$(COSMOS_BUILD_OPTIONS)))
-  BUILD_TAGS += badgerdb
+  build_tags += badgerdb
 endif
 # handle rocksdb
 ifeq (rocksdb,$(findstring rocksdb,$(COSMOS_BUILD_OPTIONS)))
-  ifneq ($(ENABLE_ROCKSDB),true)
-    $(error Cannot use RocksDB backend unless ENABLE_ROCKSDB=true)
-  endif
   CGO_ENABLED=1
-  BUILD_TAGS += rocksdb
+  build_tags += rocksdb
 endif
 # handle boltdb
 ifeq (boltdb,$(findstring boltdb,$(COSMOS_BUILD_OPTIONS)))
-  BUILD_TAGS += boltdb
+  build_tags += boltdb
 endif
 
 ifeq (,$(findstring nostrip,$(COSMOS_BUILD_OPTIONS)))