Ben Harris d505f08f67 js: explicitly tell Emscripten which browsers to target
Emscripten has settings indicating which browser versions it should
build code for.  These are now by default slightly newer than I'd been
targeting with my hand-written JavaScript.  They also don't include
Firefox 48, which KaiOS 2.5 is based on.

This commit adds CMake variables to set the minimum versions that we
pass to Emscripten.  They default to the earliest versions with
WebAssembly support, except that Firefox 48 is also supported.

I think the main consequence of this change is to stop Emscripten using
sign-extension and mutable-globals in WebAssembly, which it's done by
default since version 3.1.26.
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This is the README accompanying the source code to Simon Tatham's
puzzle collection. The collection's web site is at
<https://www.chiark.greenend.org.uk/~sgtatham/puzzles/>.

The puzzle collection is built using CMake <https://cmake.org/>. To
compile in the simplest way (on any of Linux, Windows or Mac), run
these commands in the source directory:

  cmake .
  cmake --build .

The manual is provided in Windows Help format for the Windows build;
in text format for anyone who needs it; and in HTML for the Mac OS X
application and for the web site. It is generated from a Halibut
source file (puzzles.but), which is the preferred form for
modification. To generate the manual in other formats, rebuild it,
or learn about Halibut, visit the Halibut website at
<https://www.chiark.greenend.org.uk/~sgtatham/halibut/>.
Description
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Readme 26 MiB
Languages
C 93.3%
JavaScript 1.4%
Objective-C 1.1%
CMake 1.1%
HTML 0.8%
Other 2.2%