cmake: fix licenses install rules

cmake/OpenCVFindIPP.cmake

@@ -245,7 +245,12 @@ if(NOT DEFINED IPPROOT)
     return()
   endif()
   set(IPPROOT "${ICV_PACKAGE_ROOT}/icv")
-  ocv_install_3rdparty_licenses(ippicv "${IPPROOT}/readme.htm" "${ICV_PACKAGE_ROOT}/EULA.txt")
+  ocv_install_3rdparty_licenses(ippicv "${IPPROOT}/readme.htm")
+  if(WIN32)
+    ocv_install_3rdparty_licenses(ippicv "${ICV_PACKAGE_ROOT}/EULA.rtf")
+  else()
+    ocv_install_3rdparty_licenses(ippicv "${ICV_PACKAGE_ROOT}/EULA.txt")
+  endif()
 endif()
 
 file(TO_CMAKE_PATH "${IPPROOT}" __IPPROOT)

cmake/OpenCVFindIPPIW.cmake

@@ -148,9 +148,13 @@ if(BUILD_IPP_IW)
 
   set(IPPIW_ROOT "${IPPROOT}/../iw")
   ocv_install_3rdparty_licenses(ippiw
-    "${IPPIW_ROOT}/../EULA.txt"
     "${IPPIW_ROOT}/../support.txt"
     "${IPPIW_ROOT}/../third-party-programs.txt")
+  if(WIN32)
+    ocv_install_3rdparty_licenses(ippiw "${IPPIW_ROOT}/../EULA.rtf")
+  else()
+    ocv_install_3rdparty_licenses(ippiw "${IPPIW_ROOT}/../EULA.txt")
+  endif()
 
   # Package sources
   get_filename_component(__PATH "${IPPROOT}/../iw/" ABSOLUTE)

cmake/OpenCVUtils.cmake

@@ -1200,13 +1200,17 @@ endfunction()
 # ocv_install_3rdparty_licenses(<library-name> <filename1> [<filename2> ..])
 function(ocv_install_3rdparty_licenses library)
   foreach(filename ${ARGN})
+    set(filepath "${filename}")
+    if(NOT IS_ABSOLUTE "${filepath}")
+      set(filepath "${CMAKE_CURRENT_LIST_DIR}/${filepath}")
+    endif()
     get_filename_component(name "${filename}" NAME)
     install(
-      FILES "${filename}"
-      DESTINATION "${OPENCV_OTHER_INSTALL_PATH}/licenses"
+      FILES "${filepath}"
+      DESTINATION "${OPENCV_LICENSES_INSTALL_PATH}"
       COMPONENT licenses
       RENAME "${library}-${name}"
-      OPTIONAL)
+    )
   endforeach()
 endfunction()