pkg-config 0.23 PKG_CONFIG_SYSROOT_DIR bug

[Paul Bender]

There appears to be a bug in the handling of the new 
PKG_CONFIG_SYSROOT_DIR. When PKG_CONFIG_SYSROOT_DIR is set, on the all 
but the -I and -L options are removed from --cflags and --libs 
respectively. This does not seem like the right behavior.

I have attached a patch that fixes the problem for me.
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