Proetcted symbol handling bug

[H. J. Lu]

If gcc supports visibility, it will optimize protected symbol. In
case of normal call to protected function, it won't do PIC since it
won't get overridden at the run-time. However, i386 linker doesn't
do the right thing:

# make
cc -fPIC   -c -o foo.o foo.c
ld -shared -o libfoo.so foo.o
readelf -d libfoo.so | grep TEXTREL; \
if [ $? = 0 ]; then exit 1; else exit 0; fi
 0x00000016 (TEXTREL)                    0x0
make: *** [all] Error 1

This protected symbol handling is psABI-dependent and has to be done
based on the relocation type. 

H.J.
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