main: set LC_NUMERIC to C

Tanu Kaskinen requested to merge tanuk/pulseaudio:reset-numeric-locale into master

The webrtc backend of module-echo-cancel uses sscanf() to parse floating point numbers from module arguments, which didn't work when the locale used a comma for the decimal point. Setting the LC_NUMERIC locale variable to C makes the pulseaudio process use a period as the decimal point regardless of the user's locale configuration.

Fixes: #89 (closed)

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