Import the setjump/longjump exception handling fixes from GCC 2.95.3.test3

that were removed from GCC 2.95.3.test4 and the subsequent release due
to problems on HP-UX.  However, they work just fine on all the BSD's.

W/o these patches the following program segmentation faults if compiled
with -O2 (but not -Os or -O or -O0):

#include <stdio.h>

class A {
public:
  A() { printf("c'tor A\n"); }
  ~A(){ printf("d'tor A\n"); }
};

class foo : public A {
public:
  foo()  { printf("C'tor foo\n"); throw 8; }
  ~foo() { printf("D'tor foo\n"); }
};

int main(){
  try { foo fii; }
  catch (int){ printf("catch ...\n"); }
  return 0;
}

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