Allow static and shared builds

[dhorlick]

Implements @brechtsanders's suggestion to allow the builder to specify the type of the installed craigsapp/midifile library with CMake.

References:

• Allow static and shared builds #78
• BUILD_SHARED_LIBS CMake documentation

Sample execution specifying a static library

dhorlick@brogmoid:~/diy/forks/midifile/build$ cmake ..
-- The C compiler identification is GNU 9.4.0
-- The CXX compiler identification is GNU 9.4.0
⋮
-- Configuring done
-- Generating done
-- Build files have been written to: /home/dhorlick/diy/forks/midifile/build

dhorlick@brogmoid:~/diy/forks/midifile/build$ make
Scanning dependencies of target midifile
[  0%] Building CXX object CMakeFiles/midifile.dir/src/Options.cpp.o
[  1%] Building CXX object CMakeFiles/midifile.dir/src/Binasc.cpp.o
[  2%] Building CXX object CMakeFiles/midifile.dir/src/MidiEvent.cpp.o
[  3%] Building CXX object CMakeFiles/midifile.dir/src/MidiEventList.cpp.o
[  4%] Building CXX object CMakeFiles/midifile.dir/src/MidiFile.cpp.o
[  5%] Building CXX object CMakeFiles/midifile.dir/src/MidiMessage.cpp.o
[  6%] Linking CXX static library libmidifile.a
⋮
[ 98%] Built target midi2skini
[100%] Built target mididiss

dhorlick@brogmoid:~/diy/forks/midifile/build$ sudo make install
[  6%] Built target midifile
[  7%] Built target midimean
[  9%] Built target midirange
⋮
[ 98%] Built target midi2skini
[100%] Built target mididiss
Install the project...
-- Install configuration: ""
-- Installing: /usr/local/lib/libmidifile.a
-- Up-to-date: /usr/local/include/midifile/Binasc.h
-- Up-to-date: /usr/local/include/midifile/MidiEvent.h
-- Up-to-date: /usr/local/include/midifile/MidiEventList.h
-- Up-to-date: /usr/local/include/midifile/MidiFile.h
-- Up-to-date: /usr/local/include/midifile/MidiMessage.h
-- Up-to-date: /usr/local/include/midifile/Options.h

dhorlick@brogmoid:~/diy/forks/midifile/build$ ls /usr/local/lib/
libmidifile.a  luarocks  python2.7  python3.8

Sample execution specifying a shared library

dhorlick@brogmoid:~/diy/forks/midifile/build$ cmake -DBUILD_SHARED_LIBS=ON ..
-- Configuring done
-- Generating done
-- Build files have been written to: /home/dhorlick/diy/forks/midifile/build

dhorlick@brogmoid:~/diy/forks/midifile/build$ make
[  0%] Building CXX object CMakeFiles/midifile.dir/src/Options.cpp.o
[  1%] Building CXX object CMakeFiles/midifile.dir/src/Binasc.cpp.o
[  2%] Building CXX object CMakeFiles/midifile.dir/src/MidiEvent.cpp.o
[  3%] Building CXX object CMakeFiles/midifile.dir/src/MidiEventList.cpp.o
[  4%] Building CXX object CMakeFiles/midifile.dir/src/MidiFile.cpp.o
[  5%] Building CXX object CMakeFiles/midifile.dir/src/MidiMessage.cpp.o
[  6%] Linking CXX shared library libmidifile.so
⋮
Scanning dependencies of target mididiss
[ 99%] Building CXX object CMakeFiles/mididiss.dir/tools/mididiss.cpp.o
[100%] Linking CXX executable mididiss
[100%] Built target mididiss

dhorlick@brogmoid:~/diy/forks/midifile/build$ sudo make install
[  6%] Built target midifile
[  7%] Built target midimean
[  9%] Built target midirange
⋮
[ 98%] Built target midi2skini
[100%] Built target mididiss
Install the project...
-- Install configuration: ""
-- Up-to-date: /usr/local/lib/libmidifile.so
-- Up-to-date: /usr/local/include/midifile/Binasc.h
-- Up-to-date: /usr/local/include/midifile/MidiEvent.h
-- Up-to-date: /usr/local/include/midifile/MidiEventList.h
-- Up-to-date: /usr/local/include/midifile/MidiFile.h
-- Up-to-date: /usr/local/include/midifile/MidiMessage.h
-- Up-to-date: /usr/local/include/midifile/Options.h

dhorlick@brogmoid:~/diy/forks/midifile/build$ ls /usr/local/lib/
libmidifile.so  luarocks  python2.7  python3.8