ldso: arc: add compiler option check

Option '-mno-long-calls' is not supported by all arc gcc compilers.
For instance, this option is not supported by GCC for ARCv3 processors.
Check if this option is supported before applying it.

Signed-off-by: Sergey Matyukevich <sergey.matyukevich@synopsys.com>
Signed-off-by: Pavel Kozlov <pavel.kozlov@synopsys.com>

ldso/ldso/Makefile.in

@@ -38,7 +38,8 @@ CFLAGS-ldso.c	+= -DLDSO_MULTILIB_DIR=\"$(MULTILIB_DIR)\"
 endif
 
 ifeq ($(TARGET_ARCH),arc)
-CFLAGS-ldso.c += -mno-long-calls
+$(eval $(call check-gcc-var,-mno-long-calls))
+CFLAGS-ldso.c += $(CFLAGS_-mno-long-calls)
 endif
 
 LDFLAGS-$(UCLIBC_FORMAT_DSBT_ELF)-$(UCLIBC_LDSO_NAME).so := -Wl,--dsbt-index=1