Introduce buffered I/O and replace getc with buffered read#647

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pawosm-arm wants to merge 2 commits intoflang-compiler:masterfrom

pawosm-arm:io_buffers

Commits on Apr 3, 2019

Introduce buffered I/O and replace getc with buffered read
pawosm-arm
committed
Fix performance issue with backspace (call fseek() from the loop only when really needed)
pawosm-arm
committed