libdecnumber: Don't fool around with guards to avoid #include

Some libdecnumber headers avoid including decNumber.h or decContext.h
again by checking their header guards.  Don't.  Including them
multiple times is safe, and the compiler can do it efficiently.
Signed-off-by: NMarkus Armbruster <armbru@redhat.com>
Reviewed-by: NRichard Henderson <rth@twiddle.net>

include/libdecnumber/decNumber.h

@@ -38,9 +38,7 @@
   #define DECFULLNAME "Decimal Number Module"	      /* Verbose name */
   #define DECAUTHOR   "Mike Cowlishaw"		      /* Who to blame */
 
-  #if !defined(DECCONTEXT)
-    #include "libdecnumber/decContext.h"
-  #endif
+  #include "libdecnumber/decContext.h"
 
   /* Bit settings for decNumber.bits				      */
   #define DECNEG    0x80      /* Sign; 1=negative, 0=positive or zero */

include/libdecnumber/dpd/decimal128.h

@@ -59,9 +59,7 @@
   #ifndef DECNUMDIGITS
     #define DECNUMDIGITS DECIMAL128_Pmax /* size if not already defined*/
   #endif
-  #ifndef DECNUMBER
-    #include "libdecnumber/decNumber.h"
-  #endif
+  #include "libdecnumber/decNumber.h"
 
   /* Decimal 128-bit type, accessible by bytes			      */
   typedef struct {

include/libdecnumber/dpd/decimal32.h

@@ -59,9 +59,7 @@
   #ifndef DECNUMDIGITS
     #define DECNUMDIGITS DECIMAL32_Pmax /* size if not already defined*/
   #endif
-  #ifndef DECNUMBER
-    #include "libdecnumber/decNumber.h"
-  #endif
+  #include "libdecnumber/decNumber.h"
 
   /* Decimal 32-bit type, accessible by bytes */
   typedef struct {

include/libdecnumber/dpd/decimal64.h

@@ -61,9 +61,7 @@
   #ifndef DECNUMDIGITS
     #define DECNUMDIGITS DECIMAL64_Pmax /* size if not already defined*/
   #endif
-  #ifndef DECNUMBER
-    #include "libdecnumber/decNumber.h"
-  #endif
+  #include "libdecnumber/decNumber.h"
 
   /* Decimal 64-bit type, accessible by bytes			      */
   typedef struct {