Cleanup __tls_get_addr on alpha/microblaze localplt.data

They are not required.

Checked with a make check for both ABIs.

sysdeps/unix/sysv/linux/alpha/localplt.data

@@ -23,5 +23,3 @@ libm.so: matherr + RELA R_ALPHA_GLOB_DAT
 # We used to offer inline functions that used this, so it must be exported.
 # Ought to reorg things such that carg isn't thus forced to use a plt.
 libm.so: __atan2
-# The dynamic loader needs __tls_get_addr for TLS.
-ld.so: __tls_get_addr ?

sysdeps/unix/sysv/linux/microblaze/localplt.data

@@ -4,5 +4,3 @@ libc.so: free
 libc.so: malloc
 libc.so: realloc
 libm.so: matherr
-# The dynamic loader needs __tls_get_addr for TLS.
-ld.so: __tls_get_addr ?