configure: only use -ffloat-store on i386
this option is expensive and only used on old gcc's that lack
-fexcess-precision=standed, but it's not needed on non-i386 archs
where floating point does not have excess precision anyway.
if musl ever supports m68k, i think it will need to be special-cased
too. i'm not aware of any other archs with excess precision.
diff --git a/configure b/configure
index 7e5a8df..ae05b39 100755
--- a/configure
+++ b/configure
@@ -209,7 +209,7 @@
tryflag CFLAGS_C99FSE -ffreestanding \
|| tryflag CFLAGS_C99FSE -fno-builtin
tryflag CFLAGS_C99FSE -fexcess-precision=standard \
-|| tryflag CFLAGS_C99FSE -ffloat-store
+|| { test "$ARCH" = i386 && tryflag CFLAGS_C99FSE -ffloat-store ; }
tryflag CFLAGS_C99FSE -frounding-math
#