5.x/master branch: Fix build on Visual Studio

Chun-wei Fanrequested to merge
master-msvc into master

Hi,

This attempts to fix the build on Visual Studio by:

  • Fixing gtksourcemap.c when FontConfig is not found/used.
  • Including stdlib.h in gtksourcesnippetbundle-parser.c for strtol().
  • Removing uses of g_auto* in the library and test sources.

With blessings, thank you!

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