e2fsprogs: drop unicode space in comment

Commit c1cf9ba80 (e2fsprogs: disable parallel build for host installation)
added a unicode (non-breaking) space in a comment.  Replace it with a normal
ASCII space for consistency with elsewhere.

Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/e2fsprogs/e2fsprogs.mk

@@ -79,7 +79,7 @@ E2FSPROGS_INSTALL_STAGING_OPTS = \
 	DESTDIR=$(STAGING_DIR) \
 	install-libs
 
-# Package does not build in parallel due to improper make rules
+# Package does not build in parallel due to improper make rules
 define HOST_E2FSPROGS_INSTALL_CMDS
 	$(HOST_MAKE_ENV) $(MAKE1) -C $(@D) install install-libs
 endef