lnav: fix argument to --with-libcurl and simplify

- The flag "--with-libcurl" wants curl's `opt_lib` not `opt_prefix`
- There's no need to add curl's `bin` to the PATH or to add
  "-lcrypto -lssl" to the LIBS environment variable. This happens
  indirectly via libssh2.

Closes #52.

Signed-off-by: ilovezfs <ilovezfs@icloud.com>

Formula/lnav.rb

@@ -30,21 +30,10 @@ def install
       --with-readline=#{Formula["readline"].opt_prefix}
     ]
 
-    if build.with? "curl"
-      # Specify the cURL binary path, so that the configure script
-      # can look up the correct compile time flags.
-      ENV.prepend_path "PATH", "#{Formula["curl"].bin}"
-
-      # cURL depends on libssh2, due to the 'with-libssh2' flag, which in turn
-      # depends on libcrypto and libssl. These are neither specified by the
-      # lnav configure scripts, nor curl-config binary.
-      ENV.append "LIBS", "-lcrypto -lssl"
-
-      # OS X ships with libcurl by default, albeit without sftp support. If we
-      # want lnav to use the keg-only cURL formula that we specify as a
-      # dependency, we need to pass in the path.
-      args << "--with-libcurl=#{Formula["curl"].opt_prefix}"
-    end
+    # OS X ships with libcurl by default, albeit without sftp support. If we
+    # want lnav to use the keg-only curl formula that we specify as a
+    # dependency, we need to pass in the path.
+    args << "--with-libcurl=#{Formula["curl"].opt_lib}" if build.with? "curl"
 
     system "./autogen.sh" if build.head?
     system "./configure", *args