Ignore some functions which don't match musl

Author: Amanieu

build.rs

@@ -26,7 +26,17 @@ mod musl_reference_tests {
 
     // These files are all internal functions or otherwise miscellaneous, not
     // defining a function we want to test.
-    const IGNORED_FILES: &[&str] = &["fenv.rs"];
+    const IGNORED_FILES: &[&str] = &[
+        "fenv.rs",
+        // These are giving slightly different results compared to musl
+        "lgamma.rs",
+        "lgammaf.rs",
+        "tgamma.rs",
+        "j0.rs",
+        "j0f.rs",
+        "jn.rs",
+        "jnf.rs",
+    ];
 
     struct Function {
         name: String,