build: Re-add release flags to 'linux-release-binary'

$(RELEASE_VERSION_VARIABLES) needs to be used when building a release
binary in order to use the correct telemetry key.
This was broken in 27cd148
and explains why linux usage dropped since release 2.10.1.

Author: cfergeau

Makefile

@@ -267,6 +267,7 @@ gen_release_info:
 	@sed -i s/@PODMAN_VERSION@/$(PODMAN_VERSION)/ $(RELEASE_INFO)
 
 .PHONY: linux-release-binary macos-release-binary windows-release-binary
+linux-release-binary: LDFLAGS+= $(RELEASE_VERSION_VARIABLES)
 linux-release-binary: $(BUILD_DIR)/linux-amd64/crc
 
 macos-release-binary: LDFLAGS+= -X '$(REPOPATH)/pkg/crc/version.installerBuild=true' $(RELEASE_VERSION_VARIABLES)