boost fix gentoo compilation error
original issue: https://github.com/openwrt/packages/issues/1912
build_dir/target-mips_34kc_uClibc-0.9.33.2/boost_1_58_0/tools/build/src/build/feature.jam:494: in feature.validate-value-string from module feature
error: "none" is not a known value of feature <optimization>
error: legal values: "off" "speed" "space"
patch:
diff --git a/libs/boost/Makefile b/libs/boost/Makefile
index e9c2364..83b9ab1 100644
--- a/libs/boost/Makefile
+++ b/libs/boost/Makefile
@@ -196,6 +196,7 @@ define Build/Compile
) \
bjam \
'-sBUILD=release <optimization>space <inlining>on <debug-symbols>off' \
+ --ignore-site-config \
--toolset=gcc-$(ARCH) --build-type=minimal --layout=system abi=$(BOOST_ABI) \
--disable-long-double \
$(CONFIGURE_ARGS) \