[procps] Improve gettext/libintl handling (#38646)

Fixes #38639.

var/spack/repos/builtin/packages/procps/libintl.patch

@@ -0,0 +1,10 @@
+--- a/Makefile.am	2023-06-29 14:12:25.671539354 -0500
++++ b/Makefile.am	2023-06-29 14:26:58.852425405 -0500
+@@ -1,6 +1,5 @@
+-CYGWINFLAGS =
++CYGWINFLAGS = $(LTLIBINTL)
+ if CYGWIN
+-CYGWINFLAGS += -lintl
+ usrbin_exec_PROGRAMS =
+ endif
+ 

var/spack/repos/builtin/packages/procps/package.py

@@ -27,22 +27,20 @@ class Procps(AutotoolsPackage):
     depends_on("pkgconfig@0.9.0:", type="build")
     depends_on("dejagnu", type="test")
     depends_on("iconv")
+    depends_on("gettext", type="build")
     depends_on("gettext", when="+nls")
     depends_on("ncurses")
 
     conflicts("platform=darwin", msg="procps is linux-only")
 
+    # Need to tell the build to use the tools it already has to find
+    # libintl (if appropriate).
+    patch("libintl.patch")
+
     def autoreconf(self, spec, prefix):
         sh = which("sh")
         sh("autogen.sh")
 
-    def flag_handler(self, name, flags):
-        if name == "ldlibs":
-            spec = self.spec
-            if "+nls" in spec and "intl" in spec["gettext"].libs.names:
-                flags.append("-lintl")
-        return self.build_system_flags(name, flags)
-
     def configure_args(self):
         spec = self.spec
         args = ["--with-ncurses"]