litecross: add missing arch name remapping for or1k from gcc to kernel

this was overlooked long ago and makes it so kernel headers can't be
built & installed for or1k.

litecross/Makefile

@@ -258,7 +258,7 @@ install-gcc: | obj_gcc/.lc_built
 
 ifneq ($(LINUX_SRCDIR),)
 TARGET_ARCH = $(firstword $(subst -, ,$(TARGET)))
-TARGET_ARCH_MANGLED = $(patsubst i%86,x86,$(patsubst aarch64%,arm64%,$(TARGET_ARCH)))
+TARGET_ARCH_MANGLED = $(patsubst or1k,openrisc,$(patsubst i%86,x86,$(patsubst aarch64%,arm64%,$(TARGET_ARCH))))
 LINUX_ARCH_LIST = $(sort $(notdir $(wildcard $(LINUX_SRCDIR)/arch/*)))
 LINUX_ARCH = $(lastword $(foreach a,$(LINUX_ARCH_LIST),$(if $(filter $(a)%,$(TARGET_ARCH_MANGLED)),$(a))))
 ifneq ($(LINUX_ARCH),)