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Glibc uses .machine to determine assembly optimizations to use, and G5 as well
as cell, and even power4 -maltivec resulted in power7. Mask _ALTIVEC away
as the .machine selection already did for GFX and GPOPT.

Signed-of-by: René Rebe <rene@exactcode.de>

--- gcc-11.1.0-RC-20210423/gcc/config/rs6000/rs6000.cc.vanilla	2021-04-25 22:57:16.964223106 +0200
+++ gcc-11.1.0-RC-20210423/gcc/config/rs6000/rs6000.cc	2021-04-25 22:57:27.193223841 +0200
@@ -5765,7 +5765,7 @@
   HOST_WIDE_INT flags = rs6000_isa_flags;
 
   /* Disable the flags that should never influence the .machine selection.  */
-  flags &= ~(OPTION_MASK_PPC_GFXOPT | OPTION_MASK_PPC_GPOPT | OPTION_MASK_ISEL);
+  flags &= ~(OPTION_MASK_PPC_GFXOPT | OPTION_MASK_PPC_GPOPT | OPTION_MASK_ALTIVEC | OPTION_MASK_ISEL);
 
   if ((flags & (ISA_3_1_MASKS_SERVER & ~ISA_3_0_MASKS_SERVER)) != 0)
     return "power10";