Bug 694801: fast_cmyk_to_rgb caching broken.

fast_cmyk_to_rgb had a simple 1 place cache to avoid recalculating
the same conversions again and again. The implementation was broken
though, both in C and ARM code versions. This seems to fix it.
iOS: add extra icon sizes for iOS 7
Fix 693313: increase the zoom range and use fixed steps.

Use an explicit list of resolutions for +/- zoom stepping.
Fix 695112: patch JPEG streams with missing dimensions

If a JPEG stream is missing valid values for width/height (usually -1),
Adobe Reader substitutes these using the values read from the PDF
object. This can be done by scanning and patching the data before
passing it to libjpeg.

Thanks to zeniko for the patch.
Fix 694510: Detect all ways to maximize a window in win32.

SC_MAXIMIZE is only sent when maximizing via the maximize button.
Dragging to the screen edge, double clicking the title bar or
WinKey+Up do not generate an SC_MAXIMIZE message.

Detect when gettincg a WM_SIZE message with SIZE_MAXIMIZE instead.
Fix 694428: use system CURL library if available.
Bug 695112: only patch height values in JPEG streams

If the reported height is 0 or too large, use the image size reported
in the PDF itself instead (in the case of height 0, the JPEG library
is supposed to read the correct value from the DNL segment, but libjpeg
doesn't support that).
Correctly round PNG image resolution

Currently, png_read_phys always rounds the resolution down. Many images
have a resolution just slightly shy of 96 DPI and are thus rendered too
large when they're resized from 95 to match the required 96 for output.
minor clean-up
truncate the xref after compacting

pdf_write_document still writes the entire xref with references to all
freed objects even if the xref has been compacted which makes the
result of mutool clean -ggg larger than necessary.
Remove platform/debian directory.

These files are maintained by debian. Now that debian updates the mupdf package
more regularly there is no need for us to keep our own debian packaging files.

https://packages.debian.org/unstable/main/mupdf