drop LANGUAGE_USER_MALAGASY_PLATEAU define

since it's just an alias for LANGUAGE_MALAGASY_PLATEAU,
at least as far back as
commit 6b678c13
"added/checked/aligned MS-LangIDs and mappings from new MS-LCID.pdf"

Change-Id: I18645160cb1808c967fd6efd36e1d4269e4734ff
Reviewed-on: https://gerrit.libreoffice.org/38187Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Noel Grandin <noel.grandin@collabora.co.uk>

include/i18nlangtag/lang.h

@@ -294,7 +294,7 @@ constexpr LanguageType primary(LanguageType lt) { return LanguageType(sal_uInt16
 #define LANGUAGE_LU_CHINA                   LanguageType(0x0490)
 #define LANGUAGE_LUXEMBOURGISH_LUXEMBOURG   LanguageType(0x046E)  /* obsoletes LANGUAGE_USER_LUXEMBOURGISH 0x0630 */
 #define LANGUAGE_MACEDONIAN                 LanguageType(0x042F)
-#define LANGUAGE_MALAGASY_PLATEAU           LanguageType(0x048D)  /* obsoletes LANGUAGE_USER_MALAGASY_PLATEAU 0x064F */
+#define LANGUAGE_MALAGASY_PLATEAU           LanguageType(0x048D)  /* obsoletes LANGUAGE_OBSOLETE_USER_MALAGASY_PLATEAU */
 #define LANGUAGE_MALAYALAM                  LanguageType(0x044C)  /* in India */
 #define LANGUAGE_MALAY_BRUNEI_DARUSSALAM    LanguageType(0x083E)
 #define LANGUAGE_MALAY_MALAYSIA             LanguageType(0x043E)
@@ -620,7 +620,6 @@ constexpr LanguageType primary(LanguageType lt) { return LanguageType(sal_uInt16
 #define LANGUAGE_USER_BUSHI                 LanguageType(0x064D)
 #define LANGUAGE_USER_TAHITIAN              LanguageType(0x064E)
 #define LANGUAGE_OBSOLETE_USER_MALAGASY_PLATEAU LanguageType(0x064F)
-#define LANGUAGE_USER_MALAGASY_PLATEAU      LANGUAGE_MALAGASY_PLATEAU
 #define LANGUAGE_USER_PAPIAMENTU_ARUBA      LanguageType(0x8079)  /* makeLangID( 0x20, getPrimaryLanguage( LANGUAGE_PAPIAMENTU)) */
 #define LANGUAGE_USER_SARDINIAN_CAMPIDANESE LanguageType(0x0650)
 #define LANGUAGE_USER_SARDINIAN_GALLURESE   LanguageType(0x0651)

svtools/source/misc/langtab.src

@@ -301,7 +301,7 @@ StringArray STR_ARR_SVT_LANGUAGE_TABLE
         < "Maore" ; LANGUAGE_USER_MAORE ; > ;
         < "Bushi" ; LANGUAGE_USER_BUSHI ; > ;
         < "Tahitian" ; LANGUAGE_USER_TAHITIAN ; > ;
-        < "Malagasy, Plateau" ; LANGUAGE_USER_MALAGASY_PLATEAU ; > ;
+        < "Malagasy, Plateau" ; LANGUAGE_MALAGASY_PLATEAU ; > ;
         < "Papiamentu (Netherlands Antilles)" ; LANGUAGE_PAPIAMENTU ; > ;
         < "Papiamento (Aruba)" ; LANGUAGE_USER_PAPIAMENTU_ARUBA ; > ;
         < "Sardinian, Campidanese" ; LANGUAGE_USER_SARDINIAN_CAMPIDANESE ; > ;