Honor manual requests for static linking

[Ablu]

This allows a user to statically link a library even when not using pkg-config as source. Previously, if SYSTEMDEPS_NO_PKG_CONFIG was set, the SYSTEMDEPS_LINK=static configuration was ignored.

Since the user already went above and beyond to issue a strong intent of static linking, no check is performed whether the file actually exists. The linker will scream if something is wrong.

[codecov[bot]]

Codecov Report

Merging #75 (0b30a14) into master (d1765d9) will increase coverage by 0.49%. The diff coverage is 98.18%.

@@            Coverage Diff             @@
##           master      #75      +/-   ##
==========================================
+ Coverage   62.48%   62.97%   +0.49%     
==========================================
  Files           3        3              
  Lines        3505     3565      +60     
==========================================
+ Hits         2190     2245      +55     
- Misses       1315     1320       +5     

Impacted Files	Coverage Δ
src/lib.rs	38.86% <90.00%> (+0.20%)	:arrow_up:
src/test.rs	98.57% <100.00%> (+0.06%)	:arrow_up:

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[gdesmott]

Thanks for your patch, and kudo for writing a test! :heart:

I just released 6.1.1 with it.

[Ablu]

I just released 6.1.1 with it.

Thanks :)