Export internal symbols for shared library builds (#1283)

[ArthurSonzogni]

These symbols are internal to FTXUI (located in src/), but they must be exported when building as shared libraries because of internal dependencies between the screen, dom, and component libraries. This also allows the test suite to link correctly in shared library mode.

[github-actions]

⚠️ ABI Compatibility Report

Comparing main (base) with HEAD (PR)

ABI fingerprints changed from 396e5a0e8a1982216fe0c4caadecddd7e19ad609aaff274c118c87d385978fad to da1c90b9f852f08bb50b586bc091f5d83ed48d40698edf2b0941fe2c8a83a5bc.

Detailed ABI Analysis

Checking ABI changes between origin/main and HEAD...
Building origin/main...
Building HEAD...
--------------------------------------------------------------------------------
Comparing libftxui-screen.so...
ABI changes detected for libftxui-screen.so!
  - FORWARD INCOMPATIBLE CHANGES DETECTED.

Summary of changes:
Functions changes summary: 0 Removed, 0 Changed, 11 Added functions
Variables changes summary: 0 Removed, 0 Changed, 0 Added variable
11 Added functions:

Detailed Report (filtered for ftxui::):
11 Added functions:
  [A] 'function ftxui::WordBreakProperty ftxui::CodepointToWordBreakProperty(uint32_t)'    {_ZN5ftxui28CodepointToWordBreakPropertyEj}
  [A] 'function bool ftxui::EatCodePoint(std::string_view, size_t, size_t*, uint32_t*)'    {_ZN5ftxui12EatCodePointESt17basic_string_viewIcSt11char_traitsIcEEmPmPj}
  [A] 'function bool ftxui::EatCodePoint(std::wstring_view, size_t, size_t*, uint32_t*)'    {_ZN5ftxui12EatCodePointESt17basic_string_viewIwSt11char_traitsIwEEmPmPj}
  [A] 'function int ftxui::GlyphCount(std::string_view)'    {_ZN5ftxui10GlyphCountESt17basic_string_viewIcSt11char_traitsIcEE}
  [A] 'function size_t ftxui::GlyphIterate(std::string_view, int, size_t)'    {_ZN5ftxui12GlyphIterateESt17basic_string_viewIcSt11char_traitsIcEEim}
  [A] 'function size_t ftxui::GlyphNext(std::string_view, size_t)'    {_ZN5ftxui9GlyphNextESt17basic_string_viewIcSt11char_traitsIcEEm}
  [A] 'function size_t ftxui::GlyphPrevious(std::string_view, size_t)'    {_ZN5ftxui13GlyphPreviousESt17basic_string_viewIcSt11char_traitsIcEEm}
  [A] 'function bool ftxui::IsCombining(uint32_t)'    {_ZN5ftxui11IsCombiningEj}
  [A] 'function bool ftxui::IsControl(uint32_t)'    {_ZN5ftxui9IsControlEj}
  [A] 'function bool ftxui::IsFullWidth(uint32_t)'    {_ZN5ftxui11IsFullWidthEj}
  [A] 'function std::vector<ftxui::WordBreakProperty, std::allocator<ftxui::WordBreakProperty> > ftxui::Utf8ToWordBreakProperty(std::string_view)'    {_ZN5ftxui23Utf8ToWordBreakPropertyESt17basic_string_viewIcSt11char_traitsIcEE}
--------------------------------------------------------------------------------
Comparing libftxui-dom.so...
ABI changes detected for libftxui-dom.so!
  - FORWARD INCOMPATIBLE CHANGES DETECTED.

Summary of changes:
Functions changes summary: 0 Removed, 0 Changed, 2 Added functions
Variables changes summary: 0 Removed, 0 Changed, 0 Added variable
Function symbols changes summary: 0 Removed, 0 Added function symbol not referenced by debug info
Variable symbols changes summary: 0 Removed, 3 Added variable symbols not referenced by debug info
2 Added functions:

Detailed Report (filtered for ftxui::):
2 Added functions:
  [A] 'method virtual void ftxui::NodeDecorator::ComputeRequirement()'    {_ZN5ftxui13NodeDecorator18ComputeRequirementEv}
    note that this adds a new entry to the vtable of class ftxui::NodeDecorator
  [A] 'method virtual void ftxui::NodeDecorator::SetBox(ftxui::Box)'    {_ZN5ftxui13NodeDecorator6SetBoxENS_3BoxE}
    note that this adds a new entry to the vtable of class ftxui::NodeDecorator
--------------------------------------------------------------------------------
Comparing libftxui-component.so...
No ABI changes detected for libftxui-component.so.
--------------------------------------------------------------------------------
ABI changes detected between origin/main and HEAD.