Provide the correct Solaris curl include directory.

This patch should be send upstream, but needs to be reworked into something

that they will accept.

--- libcurl.pc.in.orig 2014-09-10 12:23:52.455848654 -0700

+++ libcurl.pc.in 2014-09-10 12:24:13.252589181 -0700

@@ -26,7 +26,7 @@

prefix=@prefix@

exec_prefix=@exec_prefix@

libdir=@libdir@

-includedir=@includedir@

+includedir=@includedir@/curl

supported_protocols="@SUPPORT_PROTOCOLS@"

supported_features="@SUPPORT_FEATURES@"