Support REQUIRED in FindGettext.cmake (using FPHSA.cmake)

Alex

Modules/FindGettext.cmake

@@ -42,6 +42,9 @@ FIND_PROGRAM(GETTEXT_MSGMERGE_EXECUTABLE msgmerge)
 
 FIND_PROGRAM(GETTEXT_MSGFMT_EXECUTABLE msgfmt)
 
+INCLUDE(FindPackageHandleStandardArgs)
+FIND_PACKAGE_HANDLE_STANDARD_ARGS(Gettext  REQUIRED_VARS GETTEXT_MSGMERGE_EXECUTABLE GETTEXT_MSGFMT_EXECUTABLE)
+
 INCLUDE(CMakeParseArguments)
 
 MACRO(GETTEXT_CREATE_TRANSLATIONS _potFile _firstPoFileArg)