fix: makes serveral header definitions static to support static library builds

[nikhedonia]

No description provided.

[codecov]

Codecov Report

Merging #4006 into master will increase coverage by <.01%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master    #4006      +/-   ##
==========================================
+ Coverage   71.26%   71.27%   +<.01%     
==========================================
  Files         441      441              
  Lines       23073    22990      -83     
==========================================
- Hits        16443    16386      -57     
+ Misses       6630     6604      -26

Impacted Files	Coverage Δ
...lude/mapnik/json/unicode_string_grammar_x3_def.hpp	100% <100%> (ø)	⬆️
.../mapnik/renderer_common/apply_vertex_converter.hpp	0% <0%> (-100%)	⬇️
include/mapnik/symbolizer_base.hpp	0% <0%> (-100%)	⬇️
include/mapnik/group/group_rule.hpp	0% <0%> (-100%)	⬇️
include/mapnik/palette.hpp	0% <0%> (-60%)	⬇️
include/mapnik/enumeration.hpp	25% <0%> (-56.82%)	⬇️
...clude/mapnik/renderer_common/pattern_alignment.hpp	0% <0%> (-55.56%)	⬇️
include/mapnik/rule.hpp	0% <0%> (-50%)	⬇️
...clude/mapnik/group/group_symbolizer_properties.hpp	50% <0%> (-50%)	⬇️
include/mapnik/feature_type_style.hpp	0% <0%> (-50%)	⬇️
... and 17 more

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[artemp]

applied in e583063