remove RPM_BUILD_ROOT from asm-offsets.h

No file in rpm binary package should have the RPM_BUILD_ROOT string in it.
To simplify building of external modules, our kernel-source package
contains some temp files from the Kbuild system.  asm/asm-offsets.h is one
of the files that contains the absolute path if make O=$O is used.

  * This file was generated by /var/tmp/kernel-source-2.6.14_rc4-build/usr/src/linux-2.6.14-rc4-2/Kbuild

Remove the $RPM_BUILD_ROOT string in the shipped tempfile.

Signed-off-by: Olaf Hering <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Sam Ravnborg <[email protected]>

Kbuild

@@ -28,7 +28,7 @@ define cmd_offsets
 	 echo "/*"; \
 	 echo " * DO NOT MODIFY."; \
 	 echo " *"; \
-	 echo " * This file was generated by $(srctree)/Kbuild"; \
+	 echo " * This file was generated by Kbuild"; \
 	 echo " *"; \
 	 echo " */"; \
 	 echo ""; \