remove arch/$(ARCH)/src from the build system

the files that used to come from extra src dirs under the arch dir
have all been removed or moved to appropriate places under the main
src tree.

Makefile

@@ -17,7 +17,7 @@ includedir = $(prefix)/include
 libdir = $(prefix)/lib
 syslibdir = /lib
 
-BASE_SRCS = $(sort $(wildcard $(srcdir)/src/*/*.c $(srcdir)/arch/$(ARCH)/src/*.[csS]))
+BASE_SRCS = $(sort $(wildcard $(srcdir)/src/*/*.c))
 BASE_OBJS = $(patsubst $(srcdir)/%,%.o,$(basename $(BASE_SRCS)))
 ARCH_SRCS = $(wildcard $(srcdir)/src/*/$(ARCH)/*.[csS])
 ARCH_OBJS = $(patsubst $(srcdir)/%,%.o,$(basename $(ARCH_SRCS)))