disable libsanitizer in gcc which currently breaks build

src/core/gcc/Dockerfile

@@ -50,6 +50,7 @@ RUN set -eux; \
         --disable-fixed-point \
         --disable-libstdcxx-pch \
         --disable-multilib \
+        --disable-libsanitizer \
         --disable-nls \
         --disable-werror \
         --enable-__cxa_atexit \
@@ -58,7 +59,9 @@ RUN set -eux; \
         --enable-languages=c,c++ \
         --enable-link-serialization=2 \
         --enable-linker-build-id; \
-	make -j "$(nproc)"
+    make
+
+from build as package
 
 FROM build as install
 USER 0:0