build: start comments at beginning of line

As the comments are indented in Makefile, they are actually echoed
on the screen. This patch makes sure that the comments actually start
at the beginning of the line, and so not echoed and ignored.

PR-URL: nodejs/node#9375

Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Johan Bergström <bugs@bergstroem.nu>
Reviewed-By: Roman Reiss <me@silverwind.io>
Reviewed-By: Gibson Fahnestock <gibfahn@gmail.com>
Reviewed-By: Prince John Wesley <princejohnwesley@gmail.com>
Reviewed-By: Benjamin Gruenbaum <benjamingr@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>

Makefile

@@ -147,8 +147,8 @@ ADDONS_BINDING_GYPS := \
 test/addons/.buildstamp: config.gypi \
 	deps/npm/node_modules/node-gyp/package.json \
 	$(ADDONS_BINDING_GYPS) test/addons/.docbuildstamp
-	# Cannot use $(wildcard test/addons/*/) here, it's evaluated before
-	# embedded addons have been generated from the documentation.
+#	Cannot use $(wildcard test/addons/*/) here, it's evaluated before
+#	embedded addons have been generated from the documentation.
 	for dirname in test/addons/*/; do \
 		$(NODE) deps/npm/node_modules/node-gyp/bin/node-gyp rebuild \
 			--python="$(PYTHON)" \
@@ -237,15 +237,15 @@ test-timers-clean:
 	$(MAKE) --directory=tools clean
 
 test-v8: v8
-	# note: performs full test unless QUICKCHECK is specified
+#	note: performs full test unless QUICKCHECK is specified
 	deps/v8/tools/run-tests.py --arch=$(V8_ARCH) \
         --mode=$(BUILDTYPE_LOWER) $(V8_TEST_NO_I18N) $(QUICKCHECK_ARG) \
         --no-presubmit \
         --shell-dir=$(PWD)/deps/v8/out/$(V8_ARCH).$(BUILDTYPE_LOWER) \
 	 $(TAP_V8)
 
 test-v8-intl: v8
-	# note: performs full test unless QUICKCHECK is specified
+#	note: performs full test unless QUICKCHECK is specified
 	deps/v8/tools/run-tests.py --arch=$(V8_ARCH) \
         --mode=$(BUILDTYPE_LOWER) --no-presubmit $(QUICKCHECK_ARG) \
         --shell-dir=deps/v8/out/$(V8_ARCH).$(BUILDTYPE_LOWER) intl \
@@ -258,7 +258,7 @@ test-v8-benchmarks: v8
 	 $(TAP_V8_BENCHMARKS)
 
 test-v8-all: test-v8 test-v8-intl test-v8-benchmarks
-	# runs all v8 tests
+# runs all v8 tests
 
 apidoc_sources = $(wildcard doc/api/*.md)
 apidocs_html = $(apidoc_dirs) $(apiassets) $(addprefix out/,$(apidoc_sources:.md=.html))