Add -msoft-float to SAFECFLAGS when necessary.

libc/sysdeps/linux/common/Makefile

@@ -51,6 +51,9 @@ endif
 ifeq ($(strip $(UCLIBC_PROFILING)),y)
 SAFECFLAGS+=-DGMON_SUPPORT
 endif
+ifeq ($(strip $(UCLIBC_HAS_SOFT_FLOAT)),y)
+SAFECFLAGS += $(call check_gcc,-msoft-float,)
+endif
 
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