imake/config changes to support more processors, including AMD64 (x86_64)

- also some rework of linux.cf
  - only allow ELF systems
  - use -pipe
  - add some more defines
  - get rid of some of the ancient (libc5/linux 1) support.  Really,
    don't expect CDE to build right on such old systems.

cde/config/cf/linux.cf

@@ -56,6 +56,7 @@ XCOMM binutils:  (LinuxBinUtilsMajorVersion)
 #define UseElfFormat		YES
 #else
 #define UseElfFormat		NO
+#error "Only ELF format is supported on linux"
 #endif
 #endif
 #define BuildLibPathVar   	LD_LIBRARY_PATH
@@ -84,30 +85,13 @@ XCOMM binutils:  (LinuxBinUtilsMajorVersion)
 #define NeedWidePrototypes	NO
 #define SetTtyGroup		YES
 
-#if UseElfFormat
-#if OSMajorVersion == 1 && OSMinorVersion < 2
-#define CcCmd			gcc -b i486-linuxelf
-#define CplusplusCmd		g++ -b i486-linuxelf
-#define AsCmd			/usr/i486-linuxelf/bin/as
-#define LdCmd			ld -m elf_i386
-#else
-#define CcCmd			gcc
-#define CplusplusCmd		g++ 
+#define CcCmd			gcc -pipe
+#define CplusplusCmd		g++ -pipe -fpermissive 
 #define AsCmd			as
 #define LdCmd			ld
-#endif
+
 #define AsmDefines		-D__ELF__
-#else
-#define CcCmd			gcc
-#if OSMajorVersion == 1 && OSMinorVersion > 1
-#define AsCmd			/usr/i486-linuxaout/bin/as
-#define LdCmd			ld -m i386linux
-#else
-#define AsCmd			as
-#define LdCmd			ld
-#endif
-#define AsmDefines		-DUSE_GAS -U__ELF__
-#endif
+
 #define MkdirHierCmd		mkdir -p
 #define CppCmd			/lib/cpp
 #if OSMajorVersion >= 2
@@ -132,37 +116,52 @@ XCOMM binutils:  (LinuxBinUtilsMajorVersion)
 #endif
 
 #if LinuxCLibMajorVersion < 6
-#define LinuxSourceDefines	-D_POSIX_SOURCE \
+# define LinuxSourceDefines	-D_POSIX_SOURCE \
 				-D_BSD_SOURCE -D_SVID_SOURCE LinuxLocaleDefines
-#ifndef HasLibCrypt
-# define HasLibCrypt		NO
-#endif
-#else
-#define LinuxSourceDefines	-D_POSIX_C_SOURCE=199309L \
-				-D_POSIX_SOURCE \
-				-D_BSD_SOURCE -D_SVID_SOURCE
-#define HasPosixThreads		YES
-#define ThreadedX		YES
-#define HasThreadSafeAPI	YES
-#define ThreadsLibraries	-lpthread
-#define SystemMTDefines		-D_REENTRANT
-#ifndef HasLibCrypt
-# define HasLibCrypt		YES
-#endif
-#endif
+# ifndef HasLibCrypt
+#  define HasLibCrypt		NO
+# endif
 
-XCOMM This is needed for CDE currently
-#define CplusplusStandardDefines StandardDefines -fpermissive
+#else
+# define LinuxSourceDefines	-D_POSIX_C_SOURCE=199309L \
+				-D_POSIX_SOURCE \
+				-D_BSD_SOURCE -D_SVID_SOURCE -D_XOPEN_SOURCE \
+                                -D__NO_STRING_INLINES -D__NO_MATH_INLINES \
+                                LinuxLocaleDefines
+# define HasPosixThreads	YES
+# define ThreadedX		YES
+# define HasThreadSafeAPI	YES
+# define ThreadsLibraries	-lpthread
+# define SystemMTDefines		-D_REENTRANT
+# ifndef HasLibCrypt
+#  define HasLibCrypt		YES
+# endif
+#endif
 
 #ifdef i386Architecture
 #define OptimizedCDebugFlags	DefaultGcc2i386Opt
 #define LinuxMachineDefines	-D__i386__
+/* For DtHelp TIFF processing routines. */
+#define LSBBitOrder             YES
+
 #if UseElfFormat
 #define HasPlugin		YES
 #define VendorHasX11R6_3libXext	YES	/* XC or XFree86 3.3.1 */
 #endif
 #endif /* i386Architecture */
 
+#ifdef AMD64Architecture
+#define OptimizedCDebugFlags	DefaultGcc2i386Opt
+#define LinuxMachineDefines	-D__x86_64__ 
+/* For DtHelp TIFF processing routines. */
+#define LSBBitOrder             YES
+
+#if UseElfFormat
+#define HasPlugin		YES
+#define VendorHasX11R6_3libXext	YES	/* XC or XFree86 3.3.1 */
+#endif
+#endif /* AMD64Architecture */
+
 #ifdef AlphaArchitecture
 #define OptimizedCDebugFlags	-O2
 #define LinuxMachineDefines	-D__alpha__
@@ -171,13 +170,16 @@ XCOMM This is needed for CDE currently
 #ifdef Mc68020Architecture
 #define OptimizedCDebugFlags	-O2
 #define LinuxMachineDefines	-D__mc68000__
-#define StandardCppDefines      -traditional StandardDefines
+#define StandardCppDefines      -traditional 
 #endif /* Mc68020Architecture */
 
 #define StandardDefines		-Dlinux LinuxMachineDefines LinuxSourceDefines
 
 #define ConnectionFlags		-DUNIXCONN -DTCPCONN
 
+XCOMM This is needed for CDE currently
+#define CplusplusStandardDefines StandardDefines 
+
 /* Some of these man page defaults are overriden in the above OS sections */
 #ifndef ManSuffix
 # define ManSuffix	1x