Building with -sMAIN_MODULE vs with -sSTRICT and -l<foo> linkage

[juj]

When building with -sSTRICT, one must explicitly link in e.g. GL and HTML5 JS libraries with -lGL and -lhtml5. The intent was to avoid accidental pollution of symbols into users's builds if they so need.

When building with -sMAIN_MODULE however, it looks like one cannot manually pass -lGL or -lhtml5, or errors about duplicate symbols will result.

Seen while fixing PR #24431 (comment)

[sbc100]

I think this is a side effect of the fact that -sMAIN_MODULE=1 (not -sMAIN_MODULE=2) forces all libraries to be included via -Wl,--whole-archive.