try to force sdk version for mdimporter project, sr=mscott, NPOB, 290057

mail/components/search/mdimporter/TBSpotlight.xcodeproj/project.pbxproj

@@ -237,6 +237,7 @@
 				);
 				GCC_WARN_ABOUT_RETURN_TYPE = YES;
 				GCC_WARN_UNUSED_VARIABLE = YES;
+				MACOSX_DEPLOYMENT_TARGET = 10.4;
 				PREBINDING = NO;
 				SDKROOT = /Developer/SDKs/MacOSX10.4u.sdk;
 			};
@@ -251,6 +252,7 @@
 				);
 				GCC_WARN_ABOUT_RETURN_TYPE = YES;
 				GCC_WARN_UNUSED_VARIABLE = YES;
+				MACOSX_DEPLOYMENT_TARGET = 10.4;
 				PREBINDING = NO;
 				SDKROOT = /Developer/SDKs/MacOSX10.4u.sdk;
 			};