[API CHANGE] Remove SAL_CONSTEXPR again

...now that LIBO_INTERNAL_ONLY always has constexpr support.

It had been added for LO 5.0 (effectively always expanding to nothing for
!LIBO_INTERNAL_ONLY), not wrapped in '#if LIBO_INTERNAL_ONLY' presumably because
it was assumed to be used freely in URE include files, but turned out to be only
used in LIBO_INTERNAL_ONLY code.  It is unlikely that any 3rd party code made
use of it.

Change-Id: I68970c5a2e2d7ef68ac5b79efc8dc1de54c43198

include/sal/types.h

@@ -418,16 +418,6 @@ namespace css = ::com::sun::star;
 #define SAL_FINAL
 #endif
 
-/** C++11 "constexpr" feature.
-
-    @since LibreOffice 5.0
-*/
-#if defined LIBO_INTERNAL_ONLY
-#define SAL_CONSTEXPR constexpr
-#else
-#define SAL_CONSTEXPR
-#endif
-
 #if defined LIBO_INTERNAL_ONLY
 #if defined __clang__
 #define SAL_FALLTHROUGH [[clang::fallthrough]]

solenv/bin/create-tags

@@ -12,7 +12,7 @@ if test "$1" = "-e"; then
     ctags=etags
 fi
 
-saloptions="-ISAL_DELETED_FUNCTION -ISAL_OVERRIDE -ISAL_FINAL -ISAL_CONSTEXPR"
+saloptions="-ISAL_DELETED_FUNCTION -ISAL_OVERRIDE -ISAL_FINAL"
 omnicppoptions="--c++-kinds=+p --fields=+iaS --extra=+q"
 
 $ctags -h "+.hdl.hrc" --langmap=c:+.hrc.src,c++:+.hdl $saloptions $omnicppoptions \