tests: Remove unnecessary -C relocation-model=dynamic-no-pics

The referenced `sanitizer-address/Makefile` no longer exists, so perhaps these options are no longer necessary as well.
Even if they are still necessary, they should use `-C relocation-model=static` instead.

src/test/run-make-fulldeps/sanitizer-cdylib-link/Makefile

@@ -11,10 +11,7 @@ LOG := $(TMPDIR)/log.txt
 # are compiled with address sanitizer, and we assert that a fault in the cdylib
 # is correctly detected.
 
-# See comment in sanitizer-address/Makefile for why this is here
-EXTRA_RUSTFLAG=-C relocation-model=dynamic-no-pic
-
 all:
-	$(RUSTC) -g -Z sanitizer=address --crate-type cdylib --target $(TARGET) $(EXTRA_RUSTFLAG) library.rs
-	$(RUSTC) -g -Z sanitizer=address --crate-type bin --target $(TARGET) $(EXTRA_RUSTFLAG) -llibrary program.rs
+	$(RUSTC) -g -Z sanitizer=address --crate-type cdylib --target $(TARGET) library.rs
+	$(RUSTC) -g -Z sanitizer=address --crate-type bin --target $(TARGET) -llibrary program.rs
 	LD_LIBRARY_PATH=$(TMPDIR) $(TMPDIR)/program 2>&1 | $(CGREP) stack-buffer-overflow

src/test/run-make-fulldeps/sanitizer-dylib-link/Makefile

@@ -11,10 +11,7 @@ LOG := $(TMPDIR)/log.txt
 # are compiled with address sanitizer, and we assert that a fault in the dylib
 # is correctly detected.
 
-# See comment in sanitizer-address/Makefile for why this is here
-EXTRA_RUSTFLAG=-C relocation-model=dynamic-no-pic
-
 all:
-	$(RUSTC) -g -Z sanitizer=address --crate-type dylib --target $(TARGET) $(EXTRA_RUSTFLAG) library.rs
-	$(RUSTC) -g -Z sanitizer=address --crate-type bin --target $(TARGET) $(EXTRA_RUSTFLAG) -llibrary program.rs
+	$(RUSTC) -g -Z sanitizer=address --crate-type dylib --target $(TARGET) library.rs
+	$(RUSTC) -g -Z sanitizer=address --crate-type bin --target $(TARGET) -llibrary program.rs
 	LD_LIBRARY_PATH=$(TMPDIR) $(TMPDIR)/program 2>&1 | $(CGREP) stack-buffer-overflow