rename (rnrs bytevector) to (rnrs bytevectors)

* module/rnrs/bytevectors.scm: Rename to (rnrs bytevectors), from (rnrs
  bytevector), to match the name from the R6RS.

* benchmark-suite/benchmarks/bytevectors.bm:
* doc/ref/api-data.texi:
* doc/ref/api-foreign.texi:
* libguile/bytevectors.c:
* module/6/rnrs.scm:
* module/language/assembly.scm:
* module/language/assembly/compile-bytecode.scm:
* module/language/assembly/decompile-bytecode.scm:
* module/language/glil/compile-assembly.scm:
* module/language/tree-il/primitives.scm:
* module/srfi/srfi-4.scm:
* module/srfi/srfi-4/gnu.scm:
* module/system/foreign.scm:
* test-suite/standalone/test-ffi:
* test-suite/tests/asm-to-bytecode.test:
* test-suite/tests/bytevectors.test:
* test-suite/tests/foreign.test:
* test-suite/tests/r6rs-ports.test: Update all referrers.

test-suite/tests/asm-to-bytecode.test

@@ -15,7 +15,7 @@
 ;;;; Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 
 (define-module (test-suite tests asm-to-bytecode)
-  #:use-module (rnrs bytevector)
+  #:use-module (rnrs bytevectors)
   #:use-module ((rnrs io ports) #:select (open-bytevector-output-port))
   #:use-module (test-suite lib)
   #:use-module (system vm instruction)

test-suite/tests/bytevectors.test

@@ -20,7 +20,7 @@
 (define-module (test-bytevector)
   :use-module (test-suite lib)
   :use-module (system base compile)
-  :use-module (rnrs bytevector))
+  :use-module (rnrs bytevectors))
 
 ;;; Some of the tests in here are examples taken from the R6RS Standard
 ;;; Libraries document.

test-suite/tests/foreign.test

@@ -22,7 +22,7 @@
 
 (define-module (test-foreign)
   #:use-module (system foreign)
-  #:use-module (rnrs bytevector)
+  #:use-module (rnrs bytevectors)
   #:use-module (test-suite lib))
 
 

test-suite/tests/r6rs-ports.test

@@ -22,7 +22,7 @@
   :use-module (srfi srfi-1)
   :use-module (srfi srfi-11)
   :use-module (rnrs io ports)
-  :use-module (rnrs bytevector))
+  :use-module (rnrs bytevectors))
 
 ;;; All these tests assume Guile 1.8's port system, where characters are
 ;;; treated as octets.