binutils: fix compilation with ccache

For some reason, one of the configure checks results in some infinite
loop and ends up spawning endless gcc processes, causing OOM. Just pass
a configure var to avoid it.

Signed-off-by: Rosen Penev <[email protected]>

toolchain/binutils/Makefile

@@ -63,6 +63,9 @@ ifneq ($(CONFIG_EXTRA_TARGET_ARCH),)
 		--enable-targets=$(call qstrip,$(CONFIG_EXTRA_TARGET_ARCH_NAME))-linux-$(TARGET_SUFFIX)
 endif
 
+HOST_CONFIGURE_VARS += \
+	acx_cv_cc_gcc_supports_ada=false
+
 define Host/Prepare
 	$(call Host/Prepare/Default)
 	ln -snf $(notdir $(HOST_BUILD_DIR)) $(BUILD_DIR_TOOLCHAIN)/$(PKG_NAME)