Update macro names

Make global logic easier.

example/exm-header.h

@@ -2,7 +2,7 @@
 #define MY_HEADER
 
 // Request M*LIB to not inline functions if not the library source
-#define M_USE_EXTERN_DECL
+#define M_USE_DECL
 #include "m-string.h"
 #include "m-array.h"
 

example/exm-lib.c

@@ -1,5 +1,5 @@
 // Request M*LIB to define functions
 // This include both m-string functions and array_str templated functions
 // Defining M_USE_EXTERN_DEF override M_USE_EXTERN_DECL definition
-#define M_USE_EXTERN_DEF
+#define M_USE_DEF
 #include "exm-header.h"

example/exn-header.h

@@ -2,7 +2,7 @@
 #define MY_HEADER
 
 // Request M*LIB to not always inline functions
-#define M_USE_EXTERN_FINE_GRAINED 1
+#define M_USE_FINE_GRAINED_LINKAGE
 #include "m-string.h"
 #include "m-array.h"