Add a HAVE_ARCH_MEMMOVE option to allow overriding memmove.

Change-Id: I4b6a57e7d8e7e685c609b1d85368585b9dd197dc
Signed-off-by: Gabe Black <gabeblack@chromium.org>
Reviewed-on: http://review.coreboot.org/3761
Tested-by: build bot (Jenkins)
Reviewed-by: Ronald G. Minnich <rminnich@gmail.com>
diff --git a/src/lib/Makefile.inc b/src/lib/Makefile.inc
index d44f4a7..f1783ba 100644
--- a/src/lib/Makefile.inc
+++ b/src/lib/Makefile.inc
@@ -26,6 +26,9 @@
 bootblock-y += memcpy.c
 endif
 bootblock-y += memcmp.c
+ifneq ($(CONFIG_HAVE_ARCH_MEMMOVE),y)
+bootblock-y += memmove.c
+endif
 
 ifneq ($(CONFIG_HAVE_ARCH_MEMSET),y)
 romstage-y += memset.c
@@ -56,7 +59,9 @@
 endif
 
 romstage-y += compute_ip_checksum.c
+ifneq ($(CONFIG_HAVE_ARCH_MEMMOVE),y)
 romstage-y += memmove.c
+endif
 romstage-$(CONFIG_ARCH_X86) += gcc.c
 
 ramstage-y += hardwaremain.c
@@ -70,7 +75,9 @@
 ramstage-y += memcpy.c
 endif
 ramstage-y += memcmp.c
+ifneq ($(CONFIG_HAVE_ARCH_MEMMOVE),y)
 ramstage-y += memmove.c
+endif
 ramstage-y += malloc.c
 smm-$(CONFIG_SMM_TSEG) += malloc.c
 ramstage-y += delay.c