Function to let a user of the library specify the SVG's dimensions
This is a C macro that expands to a number with the major version of librsvg against which your program is compiled.
This is a C macro that expands to a number with the micro version of librsvg against which your program is compiled.
This is a C macro that expands to a number with the minor version of librsvg against which your program is compiled.
This is a C macro that expands to a string with the version of librsvg against which your program is compiled.