Replace (compose not PROC) with simpler idioms.

* gnu/packages/bioinformatics.scm (python-pysam)[arguments] <check>:
Use (negate proc) instead of (compose not proc).
* guix/import/cran.scm (recursive-import): Likewise.
* guix/import/elpa.scm (filter-dependencies): Use 'remove' instead of
'(filter (compose not proc) ...)'.

gnu/packages/bioinformatics.scm

@@ -1454,7 +1454,7 @@ multiple sequence alignments.")
                       (getenv "PYTHONPATH")
                       ":" (getcwd) "/build/"
                       (car (scandir "build"
-                                    (compose not (cut string-prefix? "." <>))))))
+                                    (negate (cut string-prefix? "." <>))))))
              ;; Step out of source dir so python does not import from CWD.
              (with-directory-excursion "tests"
                (setenv "HOME" "/tmp")

guix/import/cran.scm

@@ -336,7 +336,7 @@ dependencies."
               (cran->guix-package (next state) repo))
 
             ;; predicate
-            (compose not done?)
+            (negate done?)
 
             ;; generator: update the queue
             (lambda (state)

guix/import/elpa.scm

@@ -57,7 +57,7 @@ past were distributed separately from Emacs."
 (define (filter-dependencies names)
   "Remove the package names included with Emacs from the list of
 NAMES (strings)."
-  (filter (compose not emacs-standard-library?) names))
+  (remove emacs-standard-library? names))
 
 (define (elpa-name->package-name name)
   "Given the NAME of an Emacs package, return the corresponding Guix name."