dracut-install,dracut: fix ldd output parsing

dracut-install could not handle output like:
	/lib/$LIB/liblsp.so => /lib/lib64/liblsp.so (0x00007faf00727000)

also unset LD_PRELOAD, so we get a clean environment

dracut.sh

@@ -545,6 +545,7 @@ export LC_ALL=C
 export LANG=C
 unset NPATH
 unset LD_LIBRARY_PATH
+unset LD_PRELOAD
 unset GREP_OPTIONS
 
 export DRACUT_LOG_LEVEL=warning

install/dracut-install.c

@@ -391,7 +391,11 @@ static int resolve_deps(const char *src)
                 if (strstr(buf, destrootdir))
                         break;
 
-                p = strchr(buf, '/');
+                p = strstr(buf, "=>");
+                if (!p)
+                        p = buf;
+
+                p = strchr(p, '/');
                 if (p) {
                         for (q = p; *q && *q != ' ' && *q != '\n'; q++) ;
                         *q = '\0';