eliminate libc dependence of libdrpreload.so

From bruen...@google.com on December 04, 2013 12:28:42

xref issue #46 (closed) We should be able to remove these, many just by linking with string.c:

nm lib64/debug/libdrpreload.so | grep ' U ' U atoi@@GLIBC_2.2.5 U dynamorio_app_init U dynamorio_app_take_over U dynamorio_set_envp U fprintf@@GLIBC_2.2.5 U get_application_short_name U getenv@@GLIBC_2.2.5 U memmove@@GLIBC_2.2.5 U memset@@GLIBC_2.2.5 U snprintf@@GLIBC_2.2.5 U stderr@@GLIBC_2.2.5 U strchr@@GLIBC_2.2.5 U strcmp@@GLIBC_2.2.5 U strlen@@GLIBC_2.2.5 U strncpy@@GLIBC_2.2.5 U strstr@@GLIBC_2.2.5

Original issue: http://code.google.com/p/dynamorio/issues/detail?id=1334