[cairo] Let libsvg detect libpng and libjpeg in configure.

[Charles Wang]

Hi:

I want to use cairo in embedded system which is leak of flash space, so
I just want support one graphic format(such as png or jpeg). Now libsvg
MUST support both of them without the modification of the code.

The attachement is a patch to configure.in and src/svg_image.c. If
applied, configure will test libpng, libjpeg automatically and
svg_image.c will include only the detected picture format.

Thanks.

Charles  April 5, 2005.

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