[patch/libstdc++-v3] export long double versions of "C" math library on more platforms

[Matthias Klose]

When libstdc++-v3 is built on a system running glibc-2.11 or newer, a 
libstdc++.so.6 is built not exporting anymore the long double versions of "C" 
math library.  For hppa-linux this is already taken care of.  The missing 
symbols were observed on arm-linux-gnueabi and mips*-linux-gnu builds.  Joseph 
S. Myers mentioned on #gcc that more platforms which did export these in the 
past should export these as well.  It's not clear if the old ARM ABI should 
export these as well.  If the patch is accepted, it should go to the active 
branches as well.

   Matthias
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