kbuild: Fix missing system calls check on mips.

Commit 5f7efb4c (Kbuild: append missing-syscalls to the default target
list) broke MIPS build.
Reported-tested-and-acked-by: Ralf Baechle <ralf@linux-mips.org>
Signed-off-by: David Daney <david.daney@cavium.com>
Signed-off-by: Michal Marek <mmarek@suse.cz>

Kbuild

@@ -92,7 +92,7 @@ always += missing-syscalls
 targets += missing-syscalls
 
 quiet_cmd_syscalls = CALL    $<
-      cmd_syscalls = $(CONFIG_SHELL) $< $(CC) $(c_flags)
+      cmd_syscalls = $(CONFIG_SHELL) $< $(CC) $(c_flags) $(missing_syscalls_flags)
 
 missing-syscalls: scripts/checksyscalls.sh $(offsets-file) FORCE
 	$(call cmd,syscalls)

arch/mips/Makefile

@@ -286,11 +286,11 @@ CLEAN_FILES += vmlinux.32 vmlinux.64
 archprepare:
 ifdef CONFIG_MIPS32_N32
 	@echo '  Checking missing-syscalls for N32'
-	$(Q)$(MAKE) $(build)=. missing-syscalls ccflags-y="-mabi=n32"
+	$(Q)$(MAKE) $(build)=. missing-syscalls missing_syscalls_flags="-mabi=n32"
 endif
 ifdef CONFIG_MIPS32_O32
 	@echo '  Checking missing-syscalls for O32'
-	$(Q)$(MAKE) $(build)=. missing-syscalls ccflags-y="-mabi=32"
+	$(Q)$(MAKE) $(build)=. missing-syscalls missing_syscalls_flags="-mabi=32"
 endif
 
 install: