Add more useful exports to soffice's callgrind mode

Moved from TDF wiki to avoid duplication.

These three stop us getting poor performance from unusual allocators:
unset MALLOC_CHECK_ MALLOC_PERTURB_ G_SLICE

If we wedge, at least we don't do it while grabbing the mouse:
export SAL_DISABLE_FLOATGRAB=1

Turns off recovery dialog, which can be a pain:
export OOO_DISABLE_RECOVERY=1

Turns off GL watchdog. It normally kills the application, if it
seems to hang in a GL block:
export SAL_DISABLE_GL_WATCHDOG=1

Change-Id: I4ec30d363280b727cd305a6a81ccb85849697159
Reviewed-on: https://gerrit.libreoffice.org/73773
Tested-by: Jenkins
Reviewed-by: Luboš Luňák <l.lunak@collabora.com>
Reviewed-by: Xisco Faulí <xiscofauli@libreoffice.org>

desktop/scripts/soffice.sh

@@ -127,6 +127,10 @@ for arg in "$@" $EXTRAOPT ; do
                     export GLIBCXX_FORCE_NEW=1
                     ;;
                 callgrind)
+                    unset MALLOC_CHECK_ MALLOC_PERTURB_ G_SLICE
+                    export SAL_DISABLE_FLOATGRAB=1
+                    export OOO_DISABLE_RECOVERY=1
+                    export SAL_DISABLE_GL_WATCHDOG=1
                     export LD_BIND_NOW=1
                     ;;
                 esac