wvstreams: add missing includes for getuid()

Fixes http://autobuild.buildroot.net/results/2ad80b1ae823fbe196f8a65220d5d4a0dd202c4e/

Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>

package/wvstreams/wvstreams-0005-getuid.patch

@@ -0,0 +1,25 @@
+[PATCH] wvuid.cc: getuid needs sys/types.h + unistd.h
+
+Otherwise the build fails with:
+
+utils/wvuid.cc: In function 'wvuid_t wvgetuid()':
+utils/wvuid.cc:63:19: error: 'getuid' was not declared in this scope
+
+Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>
+---
+ utils/wvuid.cc |    2 ++
+ 1 file changed, 2 insertions(+)
+
+Index: wvstreams-4.6.1/utils/wvuid.cc
+===================================================================
+--- wvstreams-4.6.1.orig/utils/wvuid.cc
++++ wvstreams-4.6.1/utils/wvuid.cc
+@@ -33,6 +33,8 @@
+ 
+ #else // not WIN32
+ 
++#include <unistd.h>
++#include <sys/types.h>
+ 
+ WvString wv_username_from_uid(wvuid_t uid)
+ {