cmake: convert deprecated exec_program() to execute_process() (#1570)

cmake/PcapPlusPlusUninstall.cmake.in

@@ -7,16 +7,13 @@ string(REGEX REPLACE "\n" ";" files "${files}")
 foreach(file ${files})
   message(STATUS "Uninstalling $ENV{DESTDIR}${file}")
   if(IS_SYMLINK "$ENV{DESTDIR}${file}" OR EXISTS "$ENV{DESTDIR}${file}")
-    # If the file exists or is symlink
-    # run remove command through cmake in command mode
-    # See https://cmake.org/cmake/help/latest/manual/cmake.1.html#run-a-command-line-tool
-    exec_program(
-      "@CMAKE_COMMAND@" ARGS "-E rm -rf \"$ENV{DESTDIR}${file}\""
+    execute_process(
+      COMMAND "@CMAKE_COMMAND@" -E remove "$ENV{DESTDIR}${file}"
       OUTPUT_VARIABLE rm_out
-      RETURN_VALUE rm_retval
+      RESULT_VARIABLE rm_retval
       )
     if(NOT "${rm_retval}" STREQUAL 0)
-      message(FATAL_ERROR "Error when removing $ENV{DESTDIR}${file}")
+      message(FATAL_ERROR "Problem when removing $ENV{DESTDIR}${file}")
     endif()
   else(IS_SYMLINK "$ENV{DESTDIR}${file}" OR EXISTS "$ENV{DESTDIR}${file}")
     message(STATUS "File $ENV{DESTDIR}${file} does not exist.")