Lynx: use pkg-config to find ssl

Fixes #2131.

www-client/lynx/lynx-2.8.9dev.16.recipe

@@ -4,7 +4,7 @@ support."
 HOMEPAGE="http://lynx.invisible-island.net/"
 COPYRIGHT="1997-2016 Thomas E. Dickey"
 LICENSE="GNU GPL v2"
-REVISION="1"
+REVISION="2"
 SOURCE_URI="http://invisible-mirror.net/archives/lynx/tarballs/lynx$portVersion.tar.bz2"
 CHECKSUM_SHA256="04318a100b052d079d0018fa371aa28cfb41ab68db3a959f3b75c2170eea1bc8"
 SOURCE_DIR="lynx$portVersion"
@@ -37,12 +37,13 @@ BUILD_PREREQUIRES="
 	cmd:bzip2
 	cmd:cmp
 	cmd:ctags
-	cmd:gzip
-	cmd:make
-	cmd:tar
-	cmd:ranlib
 	cmd:gcc
+	cmd:gzip
 	cmd:ld
+	cmd:make
+	cmd:pkg_config
+	cmd:ranlib
+	cmd:tar
 	"
 
 GLOBAL_WRITABLE_FILES="