Bug#787509: gdk-pixbuf: insufficient alignment of pixdata causes FTBFS on arm64

[Edmund Grimley Evans]

Source: gdk-pixbuf
Version: 2.31.4-2
Tags: patch

netsurf failed to build on arm64:

/«BUILDDIR»/netsurf-3.2+dfsg/netsurf/gtk/window.c:1057:(.text+0x2cc):
relocation truncated to fit: R_AARCH64_LDST64_ABS_LO12_NC against
symbol `menu_cursor_pixdata' defined in .rodata section in
build-Linux-gtk/build-Linux-gtk_menu_cursor.o
collect2: error: ld returned 1 exit status

See https://buildd.debian.org/status/package.php?p=netsurf&suite=sid

The root of the problem seems to be here:

https://sources.debian.net/src/gdk-pixbuf/2.31.4-2/gdk-pixbuf/gdk-pixdata.c/

In line 768 you need alignment 8 instead of 4.
(I don't know about line 764. You could change that as well, perhaps.)

However, is there a neater, more portable way of making this stuff work?
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