Remove exports for symbols that are available for libc_nonshared
Remove exports for symbols that are available for libc_nonshared

Apperently on RHEL / CentOS 5.9 this breaks the compile since these
symbols are exported there. Also checked against Ubuntu and the symbols
are available there too.

Fixes #2217

Wirachmat/rubinius,digitalextremist/rubinius,ruipserra/rubinius,kachick/rubinius,kachick/rubinius,digitalextremist/rubinius,Wirachmat/rubinius,jsyeo/rubinius,kachick/rubinius,benlovell/rubinius,digitalextremist/rubinius,pH14/rubinius,mlarraz/rubinius,ngpestelos/rubinius,heftig/rubinius,jemc/rubinius,ruipserra/rubinius,pH14/rubinius,benlovell/rubinius,mlarraz/rubinius,ruipserra/rubinius,benlovell/rubinius,heftig/rubinius,jemc/rubinius,ngpestelos/rubinius,jemc/rubinius,pH14/rubinius,mlarraz/rubinius,sferik/rubinius,Wirachmat/rubinius,Wirachmat/rubinius,Azizou/rubinius,Azizou/rubinius,jsyeo/rubinius,jemc/rubinius,Azizou/rubinius,sferik/rubinius,kachick/rubinius,dblock/rubinius,ruipserra/rubinius,Azizou/rubinius,jsyeo/rubinius,mlarraz/rubinius,mlarraz/rubinius,jsyeo/rubinius,digitalextremist/rubinius,ruipserra/rubinius,mlarraz/rubinius,dblock/rubinius,digitalextremist/rubinius,jsyeo/rubinius,jemc/rubinius,heftig/rubinius,kachick/rubinius,dblock/rubinius,Azizou/rubinius,jemc/rubinius,sferik/rubinius,sferik/rubinius,digitalextremist/rubinius,sferik/rubinius,benlovell/rubinius,Wirachmat/rubinius,pH14/rubinius,jemc/rubinius,pH14/rubinius,ngpestelos/rubinius,benlovell/rubinius,dblock/rubinius,kachick/rubinius,kachick/rubinius,kachick/rubinius,Azizou/rubinius,dblock/rubinius,ngpestelos/rubinius,sferik/rubinius,heftig/rubinius,jsyeo/rubinius,Wirachmat/rubinius,pH14/rubinius,dblock/rubinius,dblock/rubinius,ruipserra/rubinius,heftig/rubinius,jsyeo/rubinius,ngpestelos/rubinius,digitalextremist/rubinius,mlarraz/rubinius,Azizou/rubinius,pH14/rubinius,ruipserra/rubinius,benlovell/rubinius,ngpestelos/rubinius,benlovell/rubinius,heftig/rubinius,heftig/rubinius,sferik/rubinius,Wirachmat/rubinius,ngpestelos/rubinius