tools/nolibc: drop s390 clang target override

tools/scripts/Makefile.include now has the same override,
removing the need for the one in the nolibc Makefile.

Drop the superfluous custom override.

Signed-off-by: Thomas Weißschuh <thomas.weissschuh@linutronix.de>
Link: https://lore.kernel.org/r/20250620-tools-cross-s390-v2-2-ecda886e00e5@linutronix.de
Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>

Author: t-8ch

tools/include/nolibc/Makefile

@@ -107,9 +107,6 @@ headers_standalone: headers
 	$(Q)$(MAKE) -C $(srctree) headers
 	$(Q)$(MAKE) -C $(srctree) headers_install INSTALL_HDR_PATH=$(OUTPUT)sysroot
 
-# GCC uses "s390", clang "systemz"
-CLANG_CROSS_FLAGS := $(subst --target=s390-linux,--target=systemz-linux,$(CLANG_CROSS_FLAGS))
-
 headers_check: headers_standalone
 	$(Q)for header in $(filter-out crt.h std.h,$(all_files)); do \
 		$(CC) $(CLANG_CROSS_FLAGS) -Wall -Werror -nostdinc -fsyntax-only -x c /dev/null \

tools/testing/selftests/nolibc/Makefile.nolibc

@@ -244,9 +244,6 @@ endif
 # Modify CFLAGS based on LLVM=
 include $(srctree)/tools/scripts/Makefile.include
 
-# GCC uses "s390", clang "systemz"
-CLANG_CROSS_FLAGS := $(subst --target=s390-linux,--target=systemz-linux,$(CLANG_CROSS_FLAGS))
-
 REPORT  ?= awk '/\[OK\][\r]*$$/{p++} /\[FAIL\][\r]*$$/{if (!f) printf("\n"); f++; print;} /\[SKIPPED\][\r]*$$/{s++} \
 		END{ printf("\n%3d test(s): %3d passed, %3d skipped, %3d failed => status: ", p+s+f, p, s, f); \
 		if (f || !p) printf("failure\n"); else if (s) printf("warning\n"); else printf("success\n");; \