gcc-final:

- add LTO support
- enable __cxa_atexit
- enable decimal-float support

packages/toolchain/lang/gcc-final/build

@@ -31,7 +31,10 @@ LDFLAGS="-Wl,-rpath,$ROOT/$TOOLCHAIN/lib" \
              --with-cloog=$ROOT/$TOOLCHAIN \
              --with-libelf=$ROOT/$TOOLCHAIN \
              --enable-languages=${TOOLCHAIN_LANGUAGES} \
-             --disable-__cxa_atexit \
+             --enable-__cxa_atexit \
+             --enable-lto \
+             --disable-libada \
+             --enable-decimal-float \
              --disable-libmudflap \
              --disable-libssp \
              --disable-multilib \