Change version.h and libpistache.pc install source location to use CMAKE_CURRENT_BINARY_DIR

[sourcedelica]

Fixes #559

[codecov-io]

Codecov Report

Merging #560 into master will increase coverage by 0.1%.
The diff coverage is n/a.

@@            Coverage Diff            @@
##           master     #560     +/-   ##
=========================================
+ Coverage   70.39%   70.49%   +0.1%     
=========================================
  Files          49       49             
  Lines        6951     6951             
=========================================
+ Hits         4893     4900      +7     
+ Misses       2058     2051      -7

Impacted Files	Coverage Δ
src/common/reactor.cc	80% <0%> (-0.41%)	⬇️
src/client/client.cc	81.29% <0%> (+1.52%)	⬆️

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[sourcedelica]

Thanks!