Fix compilation error with older GCC

The GCC 4.0 we still use for the "official" Mac OS X build says:
"error: conversion from ‘const char*’ to non-scalar type
‘rtl::OUString’ requested." Sigh, I guess there might be lots more of
these elsewhere in the code.

Change-Id: Ifad5722bbadd465ebfca1ac3f0b55f07a6895e12

extensions/source/update/check/updatecheckconfig.cxx

@@ -505,7 +505,7 @@ UpdateCheckConfig::getServiceNames()
 rtl::OUString
 UpdateCheckConfig::getImplName()
 {
-    return "vnd.sun.UpdateCheckConfig";
+    return rtl::OUString("vnd.sun.UpdateCheckConfig");
 }
 
 //------------------------------------------------------------------------------

extensions/source/update/check/updatecheckjob.cxx

@@ -175,7 +175,7 @@ UpdateCheckJob::getServiceNames()
 rtl::OUString
 UpdateCheckJob::getImplName()
 {
-    return "vnd.sun.UpdateCheck";
+    return rtl::OUString("vnd.sun.UpdateCheck");
 }
 
 

extensions/source/update/ui/updatecheckui.cxx

@@ -75,7 +75,7 @@ static uno::Sequence< rtl::OUString > getServiceNames()
 
 static rtl::OUString getImplementationName()
 {
-    return "vnd.sun.UpdateCheckUI";
+    return rtl::OUString("vnd.sun.UpdateCheckUI");
 }
 
 //------------------------------------------------------------------------------