configs/rx: Don't use -Os to build libgcc on rx

This appears to trigger some compiler bugs. Let's see if disabling
this option generates a working toolchain.

Signed-off-by: Keith Packard <[email protected]>

Author: keith-packard

configs/rx-zephyr-elf.config

@@ -3,4 +3,5 @@ CT_EXPERIMENTAL=y
 CT_ARCH_RX=y
 CT_TARGET_CFLAGS="-ftls-model=local-exec"
 CT_TARGET_VENDOR="zephyr"
+CT_CC_GCC_ENABLE_TARGET_OPTSPACE=n
 CT_MULTILIB=y