Upgrade mktorrent build script

[stickz]

Allows for near instantaneous torrent creation by multi-threading the hashing process, provided disk resources are available. We must apply these options directly to the Makefile. This software will not accept environment variables passed by GNU make.

• Remove unnecessary redirect with git clone.
• Properly apply compiler and build flags.
• Use pthreads and openssl for multi-threading.

[stickz]

The build log output shows this was successful. The compiler was switched to gcc with cflags and environment variables applied.

2024-06-23T02:12:52.2353248Z #82 [builder 49/62] RUN echo "CC = gcc" >> Makefile
2024-06-23T02:12:52.2353594Z #82 DONE 0.1s
2024-06-23T02:12:52.3277479Z 
2024-06-23T02:12:52.3278420Z #83 [builder 50/62] RUN echo "CFLAGS = -w -flto -O3" >> Makefile
2024-06-23T02:12:52.3279165Z #83 DONE 0.1s
2024-06-23T02:12:52.3279412Z 
2024-06-23T02:12:52.3279724Z #84 [builder 51/62] RUN echo "USE_PTHREADS = 1" >> Makefile
2024-06-23T02:12:52.3280399Z #84 DONE 0.1s
2024-06-23T02:12:52.4432959Z 
2024-06-23T02:12:52.4433537Z #85 [builder 52/62] RUN echo "USE_OPENSSL = 1" >> Makefile
2024-06-23T02:12:52.4434561Z #85 DONE 0.1s
2024-06-23T02:12:52.4434884Z 
2024-06-23T02:12:52.4435326Z #86 [builder 53/62] RUN make -j$(nproc)
2024-06-23T02:12:52.4436269Z #86 0.059 gcc -w -flto -O3 -DUSE_PTHREADS -DUSE_OPENSSL  prefix.c -o prefix
2024-06-23T02:12:52.5688462Z #86 0.130 gcc -w -flto -O3 -DUSE_PTHREADS -DUSE_OPENSSL -DPRIoff="\"ld\"" -DVERSION="\"1.1\"" -c ftw.c
2024-06-23T02:12:52.5690084Z #86 0.131 gcc -w -flto -O3 -DUSE_PTHREADS -DUSE_OPENSSL -DPRIoff="\"ld\"" -DVERSION="\"1.1\"" -c init.c
2024-06-23T02:12:52.5691738Z #86 0.132 gcc -w -flto -O3 -DUSE_PTHREADS -DUSE_OPENSSL -DPRIoff="\"ld\"" -DVERSION="\"1.1\"" -c hash_pthreads.c
2024-06-23T02:12:52.5693382Z #86 0.133 gcc -w -flto -O3 -DUSE_PTHREADS -DUSE_OPENSSL -DPRIoff="\"ld\"" -DVERSION="\"1.1\"" -c output.c
2024-06-23T02:12:52.5695325Z #86 0.184 gcc -w -flto -O3 -DUSE_PTHREADS -DUSE_OPENSSL -DPRIoff="\"ld\"" -DVERSION="\"1.1\"" -c main.c
2024-06-23T02:12:52.7555635Z #86 0.220 gcc -w -flto -O3 ftw.o init.o hash_pthreads.o output.o main.o -o mktorrent  -lpthread -lcrypto
2024-06-23T02:12:52.9170161Z #86 DONE 0.5s

[stickz]

README has been updated!