Fix sqlite3_auto_extension xEntryPoint signature

[gwenn]

Fix #1307

• Validate xEntryPoint signature

[codecov]

Codecov Report

Patch coverage: 100.00% and project coverage change: +0.05 🎉

Comparison is base (57a7b29) 80.43% compared to head (7dac07b) 80.48%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1310      +/-   ##
==========================================
+ Coverage   80.43%   80.48%   +0.05%     
==========================================
  Files          49       49              
  Lines        9915     9943      +28     
==========================================
+ Hits         7975     8003      +28     
  Misses       1940     1940              

Impacted Files	Coverage Δ
libsqlite3-sys/build.rs	64.56% <100.00%> (+2.29%)	⬆️

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