Don't include bsd/string.h if strlcpy is also defined in string.h to
avoid the following build failure on uclibc:

In file included from src/compat.hpp:41:0,
                 from src/ipc_address.cpp:31:
/tmp/instance-0/output-1/host/mips64el-buildroot-linux-uclibc/sysroot/usr/include/bsd/string.h:44:54: error: declaration of 'size_t strlcpy(char*, const char*, size_t)' has a different exception specifier
 size_t strlcpy(char *dst, const char *src, size_t siz);
                                                      ^
In file included from src/compat.hpp:34:0,
                 from src/ipc_address.cpp:31:
/tmp/instance-0/output-1/host/mips64el-buildroot-linux-uclibc/sysroot/usr/include/string.h:424:15: error: from previous declaration 'size_t strlcpy(char*, const char*, size_t) throw ()'
 extern size_t strlcpy(char *__restrict dst, const char *__restrict src,
               ^

Fixes:
 - http://autobuild.buildroot.org/results/51220b1b82774e8f6f6ed8593c58d2e3c31a1531

Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>