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/usr/share/proj/proj_def.dat is in proj-data 4.7.0-1.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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# Projection library defaults file
# SCCSID--- @(#)proj_def.dat	4.3	94/02/23	GIE	REL"
# very preliminary version
<general>
ellps=WGS84 
<>
<aea> # Conterminous U.S. map
lat_1=29.5
lat_2=45.5
<>
<lcc> # Conterminous U.S. map
lat_1=33
lat_2=45
<>
<lagrng>
W=2
<>