Merge branch 'topic/ada_language_server#1173' into 'master'

Fix passing of BUILD_MODE variable to gnatcov

See merge request eng/ide/ada_language_server!1359

Author: AnthonyLeonardoGracio

Makefile

@@ -115,7 +115,7 @@ ifneq ($(COVERAGE),)
 	# Remove artifacts from previous instrumentations, so that stale units that
 	# are not overriden by new ones don't get in our way.
 	rm -rf .obj/*/gnatcov-instr
-	$(COVERAGE_INSTR) -XVERSION=$(VERSION) XBUILD_DATE=$(BUILD_DATE) \
+	$(COVERAGE_INSTR) -XVERSION=$(VERSION) -XBUILD_DATE=$(BUILD_DATE) \
 		-Pgnat/lsp_server.gpr --projects lsp_server --projects lsp
 	$(COVERAGE_INSTR) -Pgnat/tester.gpr --projects lsp
 	$(COVERAGE_INSTR) -Pgnat/codec_test.gpr --projects lsp