refs #482 Rationalized the copying of files from source tree to build tree.

mkspecs/features/copyfiles.pri

@@ -0,0 +1,26 @@
+copy_files.name = COPY
+copy_files.input = COPY_FILES
+copy_files.CONFIG = no_link
+
+copy_files.output_function = fileCopyDestination
+defineReplace(fileCopyDestination) {
+    return($$DestRoot/$$relative_path($$1))
+}
+
+win32:isEmpty(MINGW_IN_SHELL) {
+    copy_files.commands = copy /y ${QMAKE_FILE_IN} ${QMAKE_FILE_OUT}
+}
+else {
+    copy_files.commands = mkdir -p `dirname ${QMAKE_FILE_OUT}` && \
+                          cp ${QMAKE_FILE_IN} ${QMAKE_FILE_OUT}
+}
+
+QMAKE_EXTRA_COMPILERS += copy_files
+
+
+# This CONFIG should be all that is needed to add a dependency to "make all"
+# but some snafu with absolute vs. relative paths necessitates this workaround
+# with PRE_TARGETDEPS instead.
+
+#copy_files.CONFIG += target_predeps
+PRE_TARGETDEPS += compiler_copy_files_make_all