Windows target build fixes

Meson (meson.build):

- Add "target_winver" (default: "") option to support Windows versions
  earlier Windows 7 (0x0601, the same as glib.) This sets a compiler
  command-line define "-DTARGET_WINVER=${target_winver}", which
  unconditionally sets WINVER and _WIN32_WINNT to select the requested
  target Windows API.

  Ref: https://learn.microsoft.com/en-us/cpp/porting/modifying-winver-and-win32-winnt

- Clean up building the static library.

  - Build the static library when "-Dstatic=true" is present on the
    command line, not just when doing fuzz testing.

  - Add the "*_STATIC_COMPILATION" defines to the compiler's command
    line. For Windows, ensure that libiconv is an explicit dependency
    since "pkg-config --libs --static" fails to add it as a dependency
    library.

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