Description of problem:
test dynamic_lib::tests::test_loading_cosine from rust internal testsuite fails in aarch64 and ppc64le for rhel-7.5 and rhel-alt-7.5.
The testcase runs successfully in other archs.

Version-Release number of selected component (if applicable):
rust-toolset-7-rust-1.24.0-1.el7

How reproducible:
100%

Steps to Reproduce:
1. rpmbuild --rebuild rust-toolset-7-rust-1.24.0-1.el7.src.rpm

Actual results:
...
test dynamic_lib::tests::test_loading_cosine ... FAILED                         
                                                                                
failures:                                                                       
                                                                                
---- dynamic_lib::tests::test_loading_cosine stdout ----                        
>       thread 'dynamic_lib::tests::test_loading_cosine' panicked at 'Could not load function cos: /root/rpmbuild/BUILD/rustc-1.24.0-src/build/powerpc64le-unknown-linux-gnu/stage1-rustc/powerpc64le-unknown-linux-gnu/release/deps/rustc_metadata-d7107d2994b77de0: undefined symbol: cos', librustc_metadata/dynamic_lib.rs:97:31
note: Some details are omitted, run with `RUST_BACKTRACE=full` for a verbose backtrace.
stack backtrace:                                                                
   0: std::sys::unix::backtrace::tracing::imp::unwind_backtrace                 
             at libstd/sys/unix/backtrace/tracing/gcc_s.rs:49                   
   1: std::sys_common::backtrace::print                                         
             at libstd/sys_common/backtrace.rs:68                               
             at libstd/sys_common/backtrace.rs:57                               
   2: std::panicking::default_hook::{{closure}}                                 
             at libstd/panicking.rs:381                                         
   3: std::panicking::default_hook                                              
             at libstd/panicking.rs:391                                         
   4: std::panicking::rust_panic_with_hook                                      
             at libstd/panicking.rs:577                                         
   5: std::panicking::begin_panic                                               
             at libstd/panicking.rs:538                                         
   6: std::panicking::begin_panic_fmt                                           
             at libstd/panicking.rs:522                                         
   7: rustc_metadata::dynamic_lib::tests::test_loading_cosine                   
             at librustc_metadata/dynamic_lib.rs:97                             
                                                                                
                                                                                
failures:                                                                       
    dynamic_lib::tests::test_loading_cosine                                     
                                                                                
test result: FAILED. 1 passed; 1 failed; 0 ignored; 0 measured; 0 filtered out  
...