Remove some unneeded install steps

Newlib doesn't need to be built and installed to another directory (it
won't be used, even if there).

Remove copy of libgcc.a as well, since it's already in the GCC tools
dir.

Leave the stdc/stdc++exc since we manually choose amongst them in the
link stage for C++ exceptions enabled/disabled.

Makefile

@@ -568,15 +568,15 @@ install: .stage.LINUX.install
 	rm -rf $(ARDUINO)
 	git clone https://github.com/$(GHUSER)/Arduino $(ARDUINO)
 	(cd $(ARDUINO) && git checkout $(INSTALLBRANCH) && git submodule init && git submodule update)
-	echo "-------- Building installable newlib"
-	rm -rf arena/newlib-install; mkdir -p arena/newlib-install
-	cd arena/newlib-install; $(call setenv,$@); $(REPODIR)/newlib/configure $(CONFIGURENEWLIBINSTALL); $(MAKE); $(MAKE) install
+	#echo "-------- Building installable newlib"
+	#rm -rf arena/newlib-install; mkdir -p arena/newlib-install
+	#cd arena/newlib-install; $(call setenv,$@); $(REPODIR)/newlib/configure $(CONFIGURENEWLIBINSTALL); $(MAKE); $(MAKE) install
 	echo "-------- Building installable hal"
 	rm -rf arena/hal-install; mkdir -p arena/hal-install
 	cd arena/hal-install; $(call setenv,$@); $(REPODIR)/lx106-hal/configure --prefix=$(ARDUINO)/tools/sdk/libc --libdir=$(ARDUINO)/tools/sdk/lib --host=xtensa-lx106-elf $$(echo $(call configure,$@) | sed 's/--host=[a-zA-Z0-9_-]*//' | sed 's/--prefix=[a-zA-Z0-9_-\\]*//')
 	cd arena/hal-install; $(call setenv,$@); $(MAKE) ; $(MAKE) install
 	echo "-------- Copying GCC libs"
-	cp $(call install,$@)/lib/gcc/xtensa-lx106-elf/*/libgcc.a  $(ARDUINO)/tools/sdk/lib/.
+	#cp $(call install,$@)/lib/gcc/xtensa-lx106-elf/*/libgcc.a  $(ARDUINO)/tools/sdk/lib/.
 	cp $(call install,$@)/xtensa-lx106-elf/lib/libstdc++-exc.a $(ARDUINO)/tools/sdk/lib/.
 	cp $(call install,$@)/xtensa-lx106-elf/lib/libstdc++.a     $(ARDUINO)/tools/sdk/lib/.
 	echo "-------- Copying toolchain directory"