Fixes compilation by 'guix pull' where Guile-{RSVG,Cairo} are missing.
Reported by Efraim Flashner.
* gnu/build/svg.scm: Use 'module-autoload!' rather than 'module-use!'.
		
	
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|---|---|---|
| .. | ||
| activation.scm | ||
| file-systems.scm | ||
| install.scm | ||
| linux-boot.scm | ||
| linux-container.scm | ||
| linux-initrd.scm | ||
| linux-modules.scm | ||
| marionette.scm | ||
| svg.scm | ||
| vm.scm | ||