Improve handling of autospec's --mock-opts option

This change allows specifying short/long mock options via MOCK_OPTS
without a leading backslash escape.

For example, `MOCK_OPTS="\--old-chroot --no-clean"` can now be specified
as `MOCK_OPTS="--old-chroot --no-clean"`.

Signed-off-by: Patrick McCarty <patrick.mccarty@intel.com>

Makefile.common

@@ -172,7 +172,7 @@ autospec: preautospec-checks pullrebase localreponotice clean-old-content
 		--name $(PKG_NAME) \
 		--archives $(ARCHIVES) \
 		--mock-config $(MOCK_CONFIG_VAL) \
-		--mock-opts "$(MOCK_OPTS)" \
+		--mock-opts="$(MOCK_OPTS)" \
 		$${SETVERSION:+ --version $${SETVERSION}} \
 		$${NON_INTERACTIVE:+ --non_interactive} \
 		$${SKIP_GIT:+ --skip-git} \

Makefile.toplevel

@@ -215,7 +215,7 @@ autospecnew: preautospecnew-checks localreponotice
 			--name $(NAME) \
 			--archives $(ARCHIVES) \
 			--mock-config $(MOCK_CONFIG_VAL) \
-			--mock-opts "$(MOCK_OPTS)" \
+			--mock-opts="$(MOCK_OPTS)" \
 			$${SETVERSION:+ --version $${SETVERSION}} \
 			${NON_INTERACTIVE} ${SKIP_GIT} ${CLEANUP} \
 			$(URL); \