Build GCC 16 without bootstrap again

This fixes the build and is faster.

Author: mattkretz

Dockerfile.gcc16

@@ -22,7 +22,7 @@ RUN apt-get install -y --no-install-recommends \
     ln -s ../binutils/bfd ../binutils/gas ../binutils/binutils ../binutils/ld ../binutils/libctf \
        ../binutils/libsframe ../binutils/opcodes . && \
     cd /root/gcc-16/obj && \
-    ../configure --enable-languages=c,c++,lto --prefix=/opt/gcc-16 --enable-checking=release && \
+    ../configure --enable-languages=c,c++,lto --prefix=/opt/gcc-16 --enable-checking=release --disable-bootstrap && \
     make BOOT_CFLAGS=-march=x86-64-v3 -j3 && \
     make -j3 install-strip && \
     update-alternatives --install /usr/bin/gcc-16 gcc-16 /opt/gcc-16/bin/gcc 160 --slave /usr/bin/g++-16 g++-16 /opt/gcc-16/bin/g++ && \