Fix uninstallation random failures on Windows

On Windows, the 'uninstall' target failed randomly. The CMake command
used for deleting files, 'cmake -E remove' seems to be not reliable.
Changing the command used for files deletion to 'FILE(REMOVE ...)'.

Author: PatKamin

cmake/cmake_uninstall.cmake.in

@@ -9,14 +9,7 @@ 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}")
-		execute_process(
-			COMMAND @CMAKE_COMMAND@ -E remove $ENV{DESTDIR}${file}
-			OUTPUT_VARIABLE rm_out
-			RESULT_VARIABLE rm_retval
-		)
-		if(NOT "${rm_retval}" STREQUAL 0)
-			message(FATAL_ERROR "Problem when removing $ENV{DESTDIR}${file}")
-		endif(NOT "${rm_retval}" STREQUAL 0)
+		FILE(REMOVE $ENV{DESTDIR}${file})
 	else(IS_SYMLINK "$ENV{DESTDIR}${file}" OR EXISTS "$ENV{DESTDIR}${file}")
 		message(STATUS "File $ENV{DESTDIR}${file} does not exist.")
 	endif(IS_SYMLINK "$ENV{DESTDIR}${file}" OR EXISTS "$ENV{DESTDIR}${file}")