build: Don't call make_recovery_patch if there's no recovery.

Change-Id: I7ae57f6d69293645f88cbe9cc61b7cbbe8d12430
(cherry picked from commit cbc6dc29d6ac0f42db2176177fd2d2ad74923133)
diff --git a/core/Makefile b/core/Makefile
index 07d1c94..cdf0ffe 100644
--- a/core/Makefile
+++ b/core/Makefile
@@ -1516,8 +1516,10 @@
 	$(hide) echo "oem_fingerprint_properties=$(OEM_THUMBPRINT_PROPERTIES)" >> $(zip_root)/META/misc_info.txt
 endif
 	$(call generate-userimage-prop-dictionary, $(zip_root)/META/misc_info.txt)
+ifneq ($(INSTALLED_RECOVERYIMAGE_TARGET),)
 	$(hide) PATH=$(foreach p,$(INTERNAL_USERIMAGES_BINARY_PATHS),$(p):)$$PATH MKBOOTIMG=$(MKBOOTIMG) \
 	    ./build/tools/releasetools/make_recovery_patch $(zip_root) $(zip_root)
+endif
 	@# Zip everything up, preserving symlinks
 	$(hide) (cd $(zip_root) && zip -qry ../$(notdir $@) .)
 	@# Run fs_config on all the system, vendor, boot ramdisk,