Ignore new warnings from GCC 8 on libpfm
Ignore new warnings from GCC 8 on libpfm

GCC 8 detects extra mistakes when calling formatted output functions.
Libpfm is not ready for this yet and has to ignore these messages.

Signed-off-by: Tulio Magno Quites Machado Filho <0e1b3d0765ee75ed64fa2e34822e4949a70a1429@linux.vnet.ibm.com>

rzinsly/advance-toolchain,rzinsly/advance-toolchain,advancetoolchain/advance-toolchain,advancetoolchain/advance-toolchain,rzinsly/advance-toolchain,advancetoolchain/advance-toolchain,advancetoolchain/advance-toolchain,rzinsly/advance-toolchain,rzinsly/advance-toolchain,advancetoolchain/advance-toolchain,advancetoolchain/advance-toolchain,rzinsly/advance-toolchain