Mouse cursor is a white outline on PowerPC systems.

Hello,

On big endian PowerPC, the cursors that appear in Inkscape are essentially white outlines or invisible. In `sp_cursor_pixbuf_from_xpm` the `pixmap_buffer` variable is initialized to the cursor data, however when it is sent to `gdk_pixbuf_new_from_data` the color channels would be in the incorrect byte positions. Effectively this means that most cursors are invisible or have a white outline. Other cursors such as the star shape cursor has the incorrect color showing.

I will note that other programs such as GIMP show cursors correctly.

The attached patch essentially byte swaps the integers in the buffer before it is sent to `gdk_pixbuf_new_from_data` if running on a big endian system. After applying it, the cursors appear as they should and Inkscape is once again usable. The active color used for example in the star shape cursor is correct.

The version of Inkscape is 0.91 r13725 from Debian.

I have reported this issue to Debian <https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=841853>.