gnu: vcflib: Use G-expressions.

* gnu/packages/bioinformatics.scm (vcflib)[source, arguments]: Rewrite using
G-expressions.
[arguments]: Do not return #t from custom phases.

Signed-off-by: Efraim Flashner <efraim@flashner.co.il>

gnu/packages/bioinformatics.scm

@@ -14567,7 +14567,7 @@ library automatically handles index file generation and use.")
         (base32 "1r7pnajg997zdjkf1b38m14v0zqnfx52w7nbldwh1xpbpahb1hjh"))
        (modules '((guix build utils)))
        (snippet
-        '(begin
+        #~(begin
             (substitute* "CMakeLists.txt"
               ((".*fastahack.*") "")
               ((".*smithwaterman.*") "")
@@ -14608,9 +14608,9 @@ library automatically handles index file generation and use.")
        ("intervaltree-src" ,(package-source intervaltree))
        ("multichoose-src" ,(package-source multichoose))))
     (arguments
-     `(#:tests? #f ; no tests
+     (list #:tests? #f ; no tests
            #:phases
-       (modify-phases %standard-phases
+           #~(modify-phases %standard-phases
                (add-after 'unpack 'build-shared-library
                  (lambda _
                    (substitute* "CMakeLists.txt"
@@ -14651,8 +14651,7 @@ library automatically handles index file generation and use.")
                            Description: C++ library for parsing and manipulating VCF files~@
                            Libs: -L${libdir} -lvcflib~@
                            Cflags: -I${includedir}~%"
-                           out ,version)))
-                 #t))))))
+                                 out #$version)))))))))
     (home-page "https://github.com/vcflib/vcflib/")
     (synopsis "Library for parsing and manipulating VCF files")
     (description "Vcflib provides methods to manipulate and interpret