Use POSIX macros for linux

cde/programs/dtappbuilder/src/ab/brws_mthds.c

@@ -65,7 +65,7 @@
 #define BRWS_DASH_WIDTH		3
 #define BRWS_NUM_DASHES		3
 
-#if !defined(linux)
+#if !defined(__linux__)
 /*
  * Somehow the compiler is not picking up strdup()
  * from string.h properly...

cde/programs/dtappbuilder/src/abmf/abmf.c

@@ -64,7 +64,7 @@
 #include "abmf.h"
 
 /* glibc considers CLK_TCK obsolete */
-#if defined(linux) && !defined(CLK_TCK)
+#if defined(__linux__) && !defined(CLK_TCK)
 #define CLK_TCK CLOCKS_PER_SEC
 #endif
 

cde/programs/dtappbuilder/src/abmf/stubs_c_file.c

@@ -279,7 +279,7 @@ printf_setval(GenCodeInfo genCodeInfo, ABObj obj, ...)
 {
     int			return_value = 0;
     File		codeFile = genCodeInfo->code_file;
-#if defined(linux) || defined(CSRG_BASED)
+#if defined(__linux__) || defined(CSRG_BASED)
 /* Define va_list in <va_list.h> as structure of char ** and int
  * Sun define va_list as void * */
     va_list             paramList = { 0, 0 };

cde/programs/dtappbuilder/src/abmf/write_c.c

@@ -350,7 +350,7 @@ write_func_def_params(
 	va_list	va_params
 )
 {
-#if defined(__ppc) || defined(linux)
+#if defined(__ppc) || defined(__linux__)
 #define va_start_params() __va_copy(params, va_params)
 #elif defined(CSRG_BASED)
 #define va_start_params() va_copy(params, va_params)

cde/programs/dtappbuilder/src/libAButil/util.h

@@ -66,7 +66,7 @@
 extern "C" {
 #endif
 
-#if !defined(linux)
+#if !defined(__linux__)
 extern char	*strdup(const char *);
 #endif