Fixed broken by r8007 install target

cmake/OpenCVModule.cmake

@@ -481,8 +481,8 @@ macro(ocv_create_module)
   # only "public" headers need to be installed
   if(OPENCV_MODULE_${the_module}_HEADERS AND OPENCV_MODULES_PUBLIC MATCHES "(^|;)${the_module}(;|$)")
     foreach(hdr ${OPENCV_MODULE_${the_module}_HEADERS})
-      string(REGEX REPLACE "^.*opencv2/" "opencv2/" hdr "${hdr}")
-      if(hdr MATCHES "^(opencv2/.*)/[^/]+.h(..)?$")
+      string(REGEX REPLACE "^.*opencv2/" "opencv2/" hdr2 "${hdr}")
+      if(hdr2 MATCHES "^(opencv2/.*)/[^/]+.h(..)?$")
         install(FILES ${hdr} DESTINATION "${OPENCV_INCLUDE_PREFIX}/${CMAKE_MATCH_1}" COMPONENT main)
       endif()
     endforeach()