build: require CapnProto 1.0.1 or better

This is the oldest version currently covered by Bitcoin Core's
extensive CI.

Author: Sjors

CMakeLists.txt

@@ -12,7 +12,7 @@ endif()
 
 include("cmake/compat_find.cmake")
 
-find_package(CapnProto REQUIRED)
+find_package(CapnProto 1.0.1 REQUIRED)
 find_package(Threads REQUIRED)
 
 set(MPGEN_EXECUTABLE "" CACHE FILEPATH "If specified, should be full path to an external mpgen binary to use rather than the one built internally.")