libdecnumber: Prepare libdecnumber for QEMU include structure

Consistent with other libraries in QEMU, the libdecnumber header files were
placed in include/libdecnumber, separate from the C code.  This is different
from the original libdecnumber source, where they were co-located.

Change the libdecnumber source code so that it reflects this split.  Specifically,
modify directives of the form:

    #include "xxx.h"

to look like:

    #include "libdecnumber/xxx.h"

Signed-off-by: Tom Musta <tommusta@gmail.com>
Signed-off-by: Alexander Graf <agraf@suse.de>

include/libdecnumber/decNumber.h

@@ -39,7 +39,7 @@
   #define DECAUTHOR   "Mike Cowlishaw"		      /* Who to blame */
 
   #if !defined(DECCONTEXT)
-    #include "decContext.h"
+    #include "libdecnumber/decContext.h"
   #endif
 
   /* Bit settings for decNumber.bits				      */

include/libdecnumber/decNumberLocal.h

@@ -44,7 +44,7 @@
 
   #include <stdlib.h>	      /* for abs			      */
   #include <string.h>	      /* for memset, strcpy		      */
-  #include "dconfig.h"	      /* for WORDS_BIGENDIAN                  */
+  #include "libdecnumber/dconfig.h"
 
   /* Conditional code flag -- set this to match hardware platform     */
   /* 1=little-endian, 0=big-endian	                              */

include/libdecnumber/dpd/decimal128.h

@@ -60,7 +60,7 @@
     #define DECNUMDIGITS DECIMAL128_Pmax /* size if not already defined*/
   #endif
   #ifndef DECNUMBER
-    #include "decNumber.h"		/* context and number library */
+    #include "libdecnumber/decNumber.h"
   #endif
 
   /* Decimal 128-bit type, accessible by bytes			      */

include/libdecnumber/dpd/decimal32.h

@@ -60,7 +60,7 @@
     #define DECNUMDIGITS DECIMAL32_Pmax /* size if not already defined*/
   #endif
   #ifndef DECNUMBER
-    #include "decNumber.h"		/* context and number library */
+    #include "libdecnumber/decNumber.h"
   #endif
 
   /* Decimal 32-bit type, accessible by bytes */

include/libdecnumber/dpd/decimal64.h

@@ -62,7 +62,7 @@
     #define DECNUMDIGITS DECIMAL64_Pmax /* size if not already defined*/
   #endif
   #ifndef DECNUMBER
-    #include "decNumber.h"		/* context and number library */
+    #include "libdecnumber/decNumber.h"
   #endif
 
   /* Decimal 64-bit type, accessible by bytes			      */