Use gcc command rather than find

Author: rhpvorderman

tox.ini

@@ -29,7 +29,7 @@ setenv=
     CFLAGS=-lasan -fsanitize=address -fno-omit-frame-pointer
 allowlist_externals=bash
 commands=
-    bash -c 'export LD_PRELOAD=$(find /usr/lib -name "libasan.so*" | head -n 1) && printenv LD_PRELOAD && python -c "from isal import isal_zlib" && pytest tests'
+    bash -c 'export LD_PRELOAD=$(gcc -print-file-name=libasan.so) && printenv LD_PRELOAD && python -c "from isal import isal_zlib" && pytest tests'
 
 [testenv:compliance]
 deps=pytest