Remove libcaldav.pc inadvertently copied from initial merge to GIT tree.

This partially resolves bug report 701.

libcaldav.pc

@@ -1,14 +0,0 @@
-prefix=/usr/local
-exec_prefix=${prefix}
-libdir=${exec_prefix}/lib
-includedir=${prefix}/include
-
-pkglibdir=${libdir}/libcaldav
-pkgincludedir=${includedir}/libcaldav
-
-Name: libcaldav
-Description: libcaldav is a client library for CalDAV
-Version: 0.6.5
-
-Cflags: -pthread -I/usr/include/glib-2.0 -I/usr/lib/glib-2.0/include    
-Libs: -pthread -lgthread-2.0 -lrt -lglib-2.0   -lcurl