fix cache line size for Pentium 4

src/core/ngx_cpuinfo.c

diff --git a/src/core/ngx_cpuinfo.c b/src/core/ngx_cpuinfo.c
index 2ed26b8..587f978 100644
--- a/src/core/ngx_cpuinfo.c
+++ b/src/core/ngx_cpuinfo.c
@@ -92,7 +92,7 @@
 
     if (ngx_strcmp(vendor, "GenuineIntel") == 0) {
 
-        switch (cpu[0] & 0xf00) {
+        switch ((cpu[0] & 0xf00) >> 8) {
 
         /* Pentium */
         case 5: