avro: Replace PKG_INSTALL with CMAKE_INSTALL

Allows removal of the InstallDev section as it's now implicit.

PKG_INSTALL is already defined in cmake.mk

This also installs a pkgconfig file. Added a patch to fix it up.

Signed-off-by: Rosen Penev <rosenp@gmail.com>

libs/avro/patches/010-pkgconfig.patch

@@ -0,0 +1,30 @@
+--- a/src/CMakeLists.txt
++++ b/src/CMakeLists.txt
+@@ -121,9 +121,8 @@ endif(WIN32)
+ 
+ # Install pkg-config file
+ 
+-set(prefix ${CMAKE_INSTALL_PREFIX})
+ set(VERSION ${AVRO_VERSION})
+-configure_file(avro-c.pc.in avro-c.pc)
++configure_file(avro-c.pc.in avro-c.pc @ONLY)
+ install(FILES ${CMAKE_CURRENT_BINARY_DIR}/avro-c.pc
+         DESTINATION lib/pkgconfig)
+ 
+--- a/src/avro-c.pc.in
++++ b/src/avro-c.pc.in
+@@ -1,7 +1,12 @@
++prefix=@CMAKE_INSTALL_PREFIX@
++exec_prefix=@CMAKE_INSTALL_PREFIX@
++libdir=${exec_prefix}/lib
++includedir=${prefix}/include
++
+ Name: avro-c
+ Description: C library for parsing Avro data
+ Version: @VERSION@
+ URL: http://avro.apache.org/
+-Libs: -L@prefix@/lib -lavro
+-Cflags: -I@prefix@/include
++Libs: -L${libdir} -lavro
++Cflags: -I${includedir}
+ Requires: @CODEC_PKG@