more el5 build fixes

* Link dynamically against libm to avoid relocation errors
  when building mesa on x86_64.
diff --git a/contrib/packages/rpm/el5/SPECS/tigervnc.spec b/contrib/packages/rpm/el5/SPECS/tigervnc.spec
index ea328ea..b2ff917 100644
--- a/contrib/packages/rpm/el5/SPECS/tigervnc.spec
+++ b/contrib/packages/rpm/el5/SPECS/tigervnc.spec
@@ -812,7 +812,6 @@
 ln -s `g++44 -print-file-name=libstdc++.a`
 ln -s `g++44 -print-file-name=libcrypto.a`
 ln -s `g++44 -print-file-name=libz.a`
-ln -s `g++44 -print-file-name=libm.a`
 ln -s `g++44 -print-file-name=libgcc.a`
 ln -s `g++44 -print-file-name=libpng.a`
 popd