zipl: copy new section introduced by GCC 9
zipl: copy new section introduced by GCC 9

GCC 9 is using a new section called .rodata.cst8 for some literals and
it must be included when copying the bootloaders to the bin images.

Closes: https://github.com/ibm-s390-tools/s390-tools/pull/60
Signed-off-by: Dan Horák <2591e5f46f28d303f9dc027d475a5c60d8dea17a@danny.cz>
Reviewed-by: Stefan Haberland <dec981e3bbb165d021029c42291faf06f59827c1@linux.ibm.com>
Signed-off-by: Jan Höppner <96138615ab4af0813785fa10d283f3d37eca3b78@linux.ibm.com>

ibm-s390-tools/s390-tools,ibm-s390-tools/s390-tools,ibm-s390-tools/s390-tools,ibm-s390-tools/s390-tools