[rtmpdump]: Pass variables to make instead of patching the Makefile (#5073)

* [rtmpdump]: Pass variables to make instead of patching the Makefile

* [rtmpdump]: Add `SYS=posix` to arguments to make

packages/rtmpdump.rb

@@ -7,6 +7,7 @@ class Rtmpdump < Package
   compatibility 'all'
   source_url 'https://git.ffmpeg.org/gitweb/rtmpdump.git/snapshot/c5f04a58fc2aeea6296ca7c44ee4734c18401aa3.tar.gz'
   source_sha256 'fd8c21263d93fbde8bee8aa6c5f6a657789674bb0f9e74f050651504d5f43b46'
+  @make_common_opts = ['SYS=posix', "prefix=#{CREW_PREFIX}", "libdir=#{CREW_LIB_PREFIX}", 'CRYPTO=GNUTLS']
 
   binary_url ({
      aarch64: 'https://dl.bintray.com/chromebrew/chromebrew/rtmpdump-c5f04a58f-1-chromeos-armv7l.tar.xz',
@@ -20,20 +21,12 @@ class Rtmpdump < Package
         i686: '109fb6fa70409f8ba274fa452c2e04dc1ff3ba740f618525c188139c1ddce363',
       x86_64: '0212408c6faad92b5909d77188d8c27e68ce955f61dcb5597603303e31e601ce',
   })
-  
-  def self.patch
-    system "sed -i 's,prefix=/usr/local,prefix=#{CREW_PREFIX},' Makefile"
-    system "sed -i 's,prefix=/usr/local,prefix=#{CREW_PREFIX},' librtmp/Makefile"
-    system "sed -i 's,libdir=\$(prefix)/lib,libdir=#{CREW_LIB_PREFIX},' librtmp/Makefile"
-    # OpenSSL builds are broken.
-    system "sed -e 's/^CRYPTO=OPENSSL/#CRYPTO=OPENSSL/' -e 's/#CRYPTO=GNUTLS/CRYPTO=GNUTLS/' -i Makefile -i librtmp/Makefile"
-  end
- 
+
   def self.build
-    system 'make'
+    system "make", *@make_common_opts
   end
 
   def self.install
-    system 'make', "DESTDIR=#{CREW_DEST_DIR}", 'install'
+    system 'make', *@make_common_opts, "DESTDIR=#{CREW_DEST_DIR}", 'install'
   end
 end