guile: Fix and clean up libtool propagation fixes

Fixes #37548

pkgs/development/interpreters/guile/2.0.nix

@@ -27,12 +27,15 @@
   nativeBuildInputs = [ makeWrapper gawk pkgconfig ];
   buildInputs = [ readline libtool libunistring libffi ];
 
-  propagatedBuildInputs = [ gmp boehmgc ]
-    # XXX: These ones aren't normally needed here, but since
-    # `libguile-2.0.la' reads `-lltdl -lunistring', adding them here will add
+  propagatedBuildInputs = [
+    gmp boehmgc
+
+    # XXX: These ones aren't normally needed here, but `libguile*.la' has '-l'
+    # flags for them without corresponding '-L' flags. Adding them here will add
     # the needed `-L' flags.  As for why the `.la' file lacks the `-L' flags,
     # see below.
-    ++ [ libtool libunistring ];
+    libtool libunistring
+  ];
 
   enableParallelBuilding = true;
 
@@ -70,11 +73,12 @@
 
   postInstall = ''
     wrapProgram $out/bin/guile-snarf --prefix PATH : "${gawk}/bin"
-
+  ''
     # XXX: See http://thread.gmane.org/gmane.comp.lib.gnulib.bugs/18903 for
     # why `--with-libunistring-prefix' and similar options coming from
     # `AC_LIB_LINKFLAGS_BODY' don't work on NixOS/x86_64.
-    sed -i "$out/lib/pkgconfig/guile-2.0.pc"    \
+  + ''
+    sed -i "$out/lib/pkgconfig/guile"-*.pc    \
         -e "s|-lunistring|-L${libunistring}/lib -lunistring|g ;
             s|^Cflags:\(.*\)$|Cflags: -I${libunistring}/include \1|g ;
             s|-lltdl|-L${libtool.lib}/lib -lltdl|g ;

pkgs/development/interpreters/guile/default.nix

@@ -28,12 +28,15 @@
   nativeBuildInputs = [ makeWrapper gawk pkgconfig ];
   buildInputs = [ readline libtool libunistring libffi ];
 
-  propagatedBuildInputs = [ gmp boehmgc ]
-    # XXX: These ones aren't normally needed here, but since
-    # `libguile-2.0.la' reads `-lltdl -lunistring', adding them here will add
+  propagatedBuildInputs = [
+    gmp boehmgc
+
+    # XXX: These ones aren't normally needed here, but `libguile*.la' has '-l'
+    # flags for them without corresponding '-L' flags. Adding them here will add
     # the needed `-L' flags.  As for why the `.la' file lacks the `-L' flags,
     # see below.
-    ++ [ libtool libunistring ];
+    libtool libunistring
+  ];
 
   enableParallelBuilding = true;
 
@@ -66,11 +69,12 @@
 
   postInstall = ''
     wrapProgram $out/bin/guile-snarf --prefix PATH : "${gawk}/bin"
-
+  ''
     # XXX: See http://thread.gmane.org/gmane.comp.lib.gnulib.bugs/18903 for
     # why `--with-libunistring-prefix' and similar options coming from
     # `AC_LIB_LINKFLAGS_BODY' don't work on NixOS/x86_64.
-    sed -i "$out/lib/pkgconfig/guile-2.2.pc"    \
+  + ''
+    sed -i "$out/lib/pkgconfig/guile"-*.pc    \
         -e "s|-lunistring|-L${libunistring}/lib -lunistring|g ;
             s|^Cflags:\(.*\)$|Cflags: -I${libunistring}/include \1|g ;
             s|-lltdl|-L${libtool.lib}/lib -lltdl|g ;