Remove unneeded C symbols

These are now provided by `compiler-builtins`, so there is no need to
also build the C versions. This was detected by checking for duplicate
symbols and not excluding weak symbols (like CI currently does).

Author: tgross35

compiler-builtins/build.rs

@@ -555,7 +555,6 @@ mod c {
 
         if (target.arch == "aarch64" || target.arch == "arm64ec") && consider_float_intrinsics {
             sources.extend(&[
-                ("__comparetf2", "comparetf2.c"),
                 ("__fe_getround", "fp_mode.c"),
                 ("__fe_raise_inexact", "fp_mode.c"),
             ]);
@@ -570,11 +569,11 @@ mod c {
         }
 
         if target.arch == "mips64" {
-            sources.extend(&[("__netf2", "comparetf2.c"), ("__fe_getround", "fp_mode.c")]);
+            sources.extend(&[("__fe_getround", "fp_mode.c")]);
         }
 
         if target.arch == "loongarch64" {
-            sources.extend(&[("__netf2", "comparetf2.c"), ("__fe_getround", "fp_mode.c")]);
+            sources.extend(&[("__fe_getround", "fp_mode.c")]);
         }
 
         // Remove the assembly implementations that won't compile for the target