Add -fpermissive to linux standard c++ option define in linux.cf

Remove from individual Imakefiles.

Also, remove '#if 0' block in linux.cf, and remove empty
LinuxMachineDefines. This should be working correctly.  If not, let me
know.

cde/lib/tt/lib/api/c/Imakefile

@@ -21,10 +21,6 @@ DEPEND_DEFINES = $(CXXDEPENDINCLUDES)
 DEFINES = 
 INCLUDES = -I../../../lib
 
-#if defined(LinuxArchitecture)
-CXXEXTRA_DEFINES = -fpermissive
-#endif
-
 /*** NOTE! 
  *** Every time a .o is added below it needs to be added to
  *** the lib/tt/lib Imakefile in OBJS and SHARED_OBJS

cde/lib/tt/lib/db/Imakefile

@@ -19,10 +19,6 @@ DEFINES =
 INCLUDES = -I../../lib
 ISAM_INCLUDES = -I../../mini_isam 
 
-#if defined(LinuxArchitecture)
-CXXEXTRA_DEFINES = -fpermissive
-#endif
-
 /*** NOTE!
  *** Every time a .o is added below it needs to be added to
  *** the lib/tt/lib Imakefile in DB_OBJS and SHARED_DB_OBJS

cde/lib/tt/lib/mp/Imakefile

@@ -24,10 +24,6 @@ ISAM_INCLUDES = -I../../mini_isam
 CXXEXTRA_DEFINES = -DCOMPAT_43
 #endif
 
-#if defined(LinuxArchitecture)
-CXXEXTRA_DEFINES = -fpermissive
-#endif
-
 /*** NOTE!
  *** Every time a .o is added below it needs to be added to
  *** the lib/tt/lib Imakefile in MP_OBJS and SHARED_MP_OBJS

cde/lib/tt/lib/tttk/Imakefile

@@ -21,10 +21,6 @@ DEPEND_DEFINES = $(CXXDEPENDINCLUDES)
 DEFINES =
 INCLUDES = -I../../lib
 
-#if defined(LinuxArchitecture)
-CXXEXTRA_DEFINES = -fpermissive
-#endif
-
 /*** NOTE!
  *** Every time a .o is added below it needs to be added to
  *** the lib/tt/lib Imakefile in DB_OBJS and SHARED_DB_OBJS

cde/lib/tt/lib/util/Imakefile

@@ -23,10 +23,6 @@ INCLUDES = -I../../lib
 CXXEXTRA_DEFINES = -D_ILS_MACROS
 #endif
 
-#if defined(LinuxArchitecture)
-CXXEXTRA_DEFINES = -fpermissive
-#endif
-
 /*** NOTE!
  *** Every time a .o is added below it needs to be added to
  *** the lib/tt/lib Imakefile in UTIL_OBJS and SHARED_UTIL_OBJS