Update relibc

Simplify relibc install steps (submodule needs to be updated once relibc commit is in)

See merge request redox-os/redox!1232

mk/prefix.mk

@@ -38,8 +38,6 @@ $(PREFIX)/relibc-install: $(ROOT)/relibc | $(PREFIX)/gcc-install
 	cd "$<" && \
 	export PATH="$(ROOT)/$@.partial/bin:$$PATH" && \
 	export CARGO="env -u CARGO xargo" && \
-	make -j `$(NPROC)` headers && \
-	make -j `$(NPROC)` install-headers DESTDIR="$(ROOT)/$@.partial/$(TARGET)" && \
 	make -j `$(NPROC)` all && \
 	make -j `$(NPROC)` install DESTDIR="$(ROOT)/$@.partial/$(TARGET)"
 	cd "$@.partial" && $(PREFIX_STRIP)
@@ -192,8 +190,6 @@ $(PREFIX)/relibc-freestanding-install: $(ROOT)/relibc | $(PREFIX_BASE_INSTALL) $
 	cd "$<" && \
 	export PATH="$(PREFIX_BASE_INSTALL):$(PREFIX_FREESTANDING_PATH):$$PATH" && \
 	export CARGO="env -u CARGO xargo" && \
-	make -j `$(NPROC)` headers && \
-	make -j `$(NPROC)` install-headers DESTDIR="$(ROOT)/$@.partial/$(TARGET)" && \
 	export CC_$(subst -,_,$(TARGET))="$(TARGET)-gcc -isystem $(ROOT)/$@.partial/$(TARGET)/include" && \
 	make -j `$(NPROC)` all && \
 	make -j `$(NPROC)` install DESTDIR="$(ROOT)/$@.partial/$(TARGET)"

relibc

@@ -1 +1 @@
-Subproject commit 701e64b3a1e6899e94190c84ee301474039446b9
+Subproject commit cdbbd4a426c81cb3dd83db87ee992d59f667f7c5