patch: remove out-of-file build machinery

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>

editors/Config.src

@@ -60,12 +60,6 @@ config ED
 	  Small, simple, evil. Part of SUSv3. If you're not already using
 	  this, you don't need it.
 
-config PATCH
-	bool "patch"
-	default y
-	help
-	  Apply a unified diff formatted patch.
-
 config SED
 	bool "sed"
 	default y

editors/Kbuild.src

@@ -11,6 +11,5 @@ lib-$(CONFIG_AWK)       += awk.o
 lib-$(CONFIG_CMP)       += cmp.o
 lib-$(CONFIG_DIFF)      += diff.o
 lib-$(CONFIG_ED)        += ed.o
-lib-$(CONFIG_PATCH)     += patch.o
 lib-$(CONFIG_SED)       += sed.o
 lib-$(CONFIG_VI)        += vi.o