Add cmake module find script (floe#109)

Author: phlash

FindBackscrub.cmake

@@ -0,0 +1,15 @@
+# Helper for super-projects to use libbackscrub
+
+# search for the built target export file
+file(GLOB_RECURSE _bs_targets
+	"${CMAKE_CURRENT_LIST_DIR}/*/BackscrubTargets.cmake")
+list(LENGTH _bs_targets _bs_len)
+if(NOT ${_bs_len})
+	message(FATAL_ERROR "Unable to find BackscrubTargets.cmake in ${CMAKE_CURRENT_LIST_DIR}")
+endif()
+list(GET _bs_targets 0 _bs_target)
+message(STATUS "Using Backscrub build: ${_bs_target}")
+set(BACKSCRUB_FOUND "true")
+include("${_bs_target}")
+set(BACKSCRUB_INCLUDE "${CMAKE_CURRENT_LIST_DIR}")
+set(BACKSCRUB_LIBS backscrub)