Changes

Summary

1. fix type of curl option setting (details)
2. use ccache for C++ compilation (details)
3. Order calloc parameters correctly (details)

Commit 3305cc5f411cb5ffd4e1be4f3e57e08939d26356 by Vincent Sanders fix type of curl option setting
	content/fetchers/curl.c (diff)
Commit 8ab50c3a163f79bcaf038168a995e4f008695f00 by Vincent Sanders use ccache for C++ compilation
	Makefile.tools (diff)
Commit 21fd4c8fb60c6bde51943c503ba5d0ebf4b9d61f by Vincent Sanders Order calloc parameters correctly
	utils/bloom.c (diff)
	tools/convert_font.c (diff)
	frontends/riscos/toolbar.c (diff)