message: Build librelibc without incremental support, gc-sections for ld.so
diff: @@ -94,7 +94,7 @@ $(BUILD)/debug/libc.so: $(BUILD)/debug/librelibc.patched.a $(BUILD)/pthreads-emb
  $(CC) -nostdlib -shared -Wl,--whole-archive $^ -Wl,--no-whole-archive -o $@
  $(BUILD)/debug/librelibc.a: $(SRC)
  - $(CARGO) rustc $(CARGOFLAGS) -- --emit link=$@ $(RUSTCFLAGS)
  + CARGO_INCREMENTAL=0 $(CARGO) rustc $(CARGOFLAGS) -- --emit link=$@ $(RUSTCFLAGS)
  touch $@
  $(BUILD)/debug/librelibc.patched.a: $(BUILD)/debug/librelibc.a
  @@ -119,7 +119,7 @@ $(BUILD)/debug/ld_so.o: $(SRC)
  touch $@
  $(BUILD)/debug/ld_so: $(BUILD)/debug/ld_so.o $(BUILD)/debug/crti.o $(BUILD)/debug/libc.a $(BUILD)/debug/crtn.o
  - $(LD) $^ -o $@
  + $(LD) --gc-sections $^ -o $@
  # Release targets
  @@ -136,7 +136,7 @@ $(BUILD)/release/libc.so: $(BUILD)/release/librelibc.patched.a $(BUILD)/pthreads
  $(CC) -nostdlib -shared -Wl,--whole-archive $^ -Wl,--no-whole-archive -o $@
  $(BUILD)/release/librelibc.a: $(SRC)
  - $(CARGO) rustc --release $(CARGOFLAGS) -- --emit link=$@ $(RUSTCFLAGS)
  + CARGO_INCREMENTAL=0 $(CARGO) rustc --release $(CARGOFLAGS) -- --emit link=$@ $(RUSTCFLAGS)
  touch $@
  $(BUILD)/release/librelibc.patched.a: $(BUILD)/release/librelibc.a
  @@ -161,7 +161,7 @@ $(BUILD)/release/ld_so.o: $(SRC)
  touch $@
  $(BUILD)/release/ld_so: $(BUILD)/release/ld_so.o $(BUILD)/release/crti.o $(BUILD)/release/libc.a $(BUILD)/release/crtn.o
  - $(LD) $^ -o $@
  + $(LD) --gc-sections $^ -o $@
  # Other targets
  