Spelling and grammar fixes for console output

This commit fixes a typo in a console debug message encountered during
encoding. It also fixes a grammatical error in the same message.

Signed-off-by: Erik de Castro Lopo <erikd@mega-nerd.com>
Grammatical error in make file comment fixed

Signed-off-by: Erik de Castro Lopo <erikd@mega-nerd.com>
src/flac/decode.c : Add WAVEFORMATEXTENSIBLE to WAV files as needed.

Patch-by: lvqcl <lvqcl.mail@gmail.com>