Build fixes & improvements

- Compile everything with level 3 optimizations.
- Disable warnings for the rtorrent software stack to prevent overflows and reduce overall ARM build time.
- Fix critical issues with xml-rpc and libtorrent not applying the build flags.
-Add build flags to mktorrent.

Dockerfile

@@ -130,8 +130,8 @@ COPY --from=src-xmlrpc /src .
 RUN ./configure \
    --disable-wininet-client \
    --disable-libwww-client
-RUN make -j$(nproc)
-RUN make install -j$(nproc) CXXFLAGS="-flto"
+RUN make -j$(nproc) CFLAGS="-w -O3 -flto" CXXFLAGS="-w -O3 -flto"
+RUN make install -j$(nproc)
 RUN make DESTDIR=${DIST_PATH} install -j$(nproc)
 RUN tree ${DIST_PATH}
 
@@ -142,8 +142,8 @@ RUN patch -p1 < throttle-fix-0.13.8.patch
 RUN ./autogen.sh
 RUN ./configure \
   --with-posix-fallocate
-RUN make -j$(nproc)
-RUN make install -j$(nproc) CXXFLAGS="-O2 -flto"
+RUN make -j$(nproc) CXXFLAGS="-w -O3 -flto"
+RUN make install -j$(nproc)
 RUN make DESTDIR=${DIST_PATH} install -j$(nproc)
 RUN tree ${DIST_PATH}
 
@@ -160,14 +160,14 @@ RUN ./autogen.sh
 RUN ./configure \
   --with-xmlrpc-c \
   --with-ncurses
-RUN make -j$(nproc) CXXFLAGS="-O2 -flto"
+RUN make -j$(nproc) CXXFLAGS="-w -O3 -flto"
 RUN make install -j$(nproc)
 RUN make DESTDIR=${DIST_PATH} install -j$(nproc)
 RUN tree ${DIST_PATH}
 
 WORKDIR /usr/local/src/mktorrent
 COPY --from=src-mktorrent /src .
-RUN make -j$(nproc)
+RUN make -j$(nproc) CC=gcc CFLAGS="-w -O3 -flto"
 RUN make install -j$(nproc)
 RUN make DESTDIR=${DIST_PATH} install -j$(nproc)
 RUN tree ${DIST_PATH}