[API CHANGE] Remove SAL_BOUND again

...that had been added to the stable URE interface, apparently by mistake, with
7474699a "contains some slightly changed macros
from vos/macros.hxx", then removed with 2f0803e5
"remove unused macros, and add SAL_N_ELEMENTS", then re-introduced with
d441fa1f "remvove vos/macros.h usage".

The last internal uses have now been removed with
<https://gerrit.libreoffice.org/63264> "Replace uses of SAL_BOUND with
o3tl::clamp".

Change-Id: I0dd842533d97fa878606cbf62efb9fa46c029088
Reviewed-on: https://gerrit.libreoffice.org/63265
Tested-by: Jenkins
Reviewed-by: Stephan Bergmann <sbergman@redhat.com>

include/sal/macros.h

@@ -48,10 +48,6 @@
 #    endif
 #endif
 
-#ifndef SAL_BOUND
-#    define SAL_BOUND(x,l,h)        ((x) <= (l) ? (l) : ((x) >= (h) ? (h) : (x)))
-#endif
-
 #ifndef SAL_STRINGIFY
 #   define SAL_STRINGIFY_ARG(x) #x
 #   define SAL_STRINGIFY(x) SAL_STRINGIFY_ARG(x)