Bug#849339: Please fix xcolorsel on hppa Linux arch

[Helge Deller <deller@gmx.de>]

alternatively, this patch works too.
Please apply.
THX, Helge

diff -up ./Imakefile.org ./Imakefile
--- ./Imakefile.org	2021-09-27 19:22:53.976568137 +0000
+++ ./Imakefile	2021-09-27 19:27:11.670928299 +0000
@@ -49,7 +49,7 @@
 
 /* Please add any preprocessor defines in config.h */
 
-#ifdef HPArchitecture
+#if defined(HPArchitecture) && !defined(__linux__)
 CCOPTIONS = -Aa -D_HPUX_SOURCE
 #endif