testsuite: Fix gcc.dg/analyzer/allocation-size-multiline-3.c

testsuite: Fix gcc.dg/analyzer/allocation-size-multiline-3.c

For 32-bit newlib targets (such as cris-elf and pru-elf),
that int32_t is "long int".  See other regexps in the
testsuite matching "aka (long )?int" (with single-quotes
where needed) where the pattern in
allocation-size-multiline-3.c matches plain "int".  Uses the
special syntax recently introduced for multi-line patterns.

testsuite:
	* gcc.dg/analyzer/allocation-size-multiline-3.c: Handle
	int32_t being "long int".