Fill NNG_PKGS to request nng dependencies from installed location.

[gdamore]

Signed-off-by: Andrey Vostrikov [email protected]

[codecov]

Codecov Report

Merging #1641 (3802bf1) into master (e7a3e41) will decrease coverage by 0.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #1641      +/-   ##
==========================================
- Coverage   79.37%   79.36%   -0.01%     
==========================================
  Files          89       89              
  Lines       20135    20135              
==========================================
- Hits        15982    15980       -2     
- Misses       4153     4155       +2     

Impacted Files	Coverage Δ
src/platform/posix/posix_tcpdial.c	69.26% <0.00%> (-5.86%)	⬇️
src/core/pipe.c	92.46% <0.00%> (-1.37%)	⬇️
src/platform/posix/posix_resolv_gai.c	75.74% <0.00%> (-1.28%)	⬇️
src/core/dialer.c	83.19% <0.00%> (-1.23%)	⬇️
src/platform/posix/posix_tcpconn.c	80.34% <0.00%> (-0.43%)	⬇️
src/sp/transport/tcp/tcp.c	75.25% <0.00%> (-0.34%)	⬇️
src/sp/transport/tls/tls.c	75.08% <0.00%> (-0.33%)	⬇️
src/supplemental/websocket/websocket.c	67.42% <0.00%> (+0.27%)	⬆️
src/supplemental/http/http_conn.c	81.99% <0.00%> (+0.27%)	⬆️
src/platform/posix/posix_ipcconn.c	79.03% <0.00%> (+0.43%)	⬆️
... and 6 more

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