Use ENV shortcut methods where applicable

Signed-off-by: Jack Nagel <jacknagel@gmail.com>

Formula/boost.rb

@@ -67,7 +67,7 @@ class Boost < Formula
 
     # Force boost to compile using the appropriate GCC version
     open("user-config.jam", "a") do |file|
-      file.write "using darwin : : #{ENV['CXX']} ;\n"
+      file.write "using darwin : : #{ENV.cxx} ;\n"
       file.write "using mpi ;\n" if ARGV.include? '--with-mpi'
     end
 

Formula/dcal.rb

@@ -7,7 +7,7 @@ class Dcal < Formula
   version '0.1.0'
 
   def install
-    system "#{ENV['CXX']}", "dcal.c", "-o", "dcal"
+    system ENV.cxx, "dcal.c", "-o", "dcal"
     bin.install 'dcal'
   end
 end

Formula/ddrescue.rb

@@ -9,7 +9,7 @@ class Ddrescue < Formula
   def install
     system "./configure", "--disable-debug", "--disable-dependency-tracking",
                           "--prefix=#{prefix}",
-                          "CXX=#{ENV['CXX']}"
+                          "CXX=#{ENV.cxx}"
     system "make install"
   end
 end

Formula/hllib.rb

@@ -36,7 +36,7 @@ class Hllib < Formula
       inreplace 'Main.c', 'HLExtract.exe', 'hlextract'
       # Make the binary build path and build
       bin.mkpath
-      system ENV['CC'], 'Main.c', "-I#{include}", "-L#{lib}", '-lhl', '-o', bin+'hlextract'
+      system ENV.cc, 'Main.c', "-I#{include}", "-L#{lib}", '-lhl', '-o', bin+'hlextract'
     end
   end
 end

Formula/jack.rb

@@ -14,7 +14,7 @@ class Jack < Formula
   end
 
   def install
-    ENV['LINKFLAGS'] = ENV['LDFLAGS']
+    ENV['LINKFLAGS'] = ENV.ldflags
     system "./waf","configure","--prefix=#{prefix}"
     system "./waf","build"
     system "./waf","install"

Formula/malbolge.rb

@@ -12,7 +12,7 @@ class Malbolge < Formula
   end
 
   def install
-    system "#{ENV['CXX']}", "malbolge.c", "-o", "malbolge"
+    system ENV.cxx, "malbolge.c", "-o", "malbolge"
     bin.install 'malbolge'
   end
 end

Formula/ocrad.rb

@@ -9,6 +9,6 @@ class Ocrad < Formula
   def install
     system "./configure", "--disable-debug", "--disable-dependency-tracking",
                           "--prefix=#{prefix}"
-    system "make", "install", "CXXFLAGS=#{ENV['CXXFLAGS']}"
+    system "make", "install", "CXXFLAGS=#{ENV.cxxflags}"
   end
 end

Formula/pngrewrite.rb

@@ -7,7 +7,7 @@ class Pngrewrite < Formula
 
   def install
     ENV.libpng
-    system "#{ENV.cc} #{ENV['CFLAGS']} #{ENV['CPPFLAGS']} -o pngrewrite pngrewrite.c #{ENV['LDFLAGS']} -lpng"
+    system "#{ENV.cc} #{ENV.cflags} #{ENV.cppflags} -o pngrewrite pngrewrite.c #{ENV.ldflags} -lpng"
     bin.install 'pngrewrite'
   end
 end

Formula/qt.rb

@@ -76,7 +76,7 @@ class Qt < Formula
     end
 
     # Needed for Qt 4.8.1 due to attempting to link moc with gcc.
-    ENV['LD'] = ENV['CXX']
+    ENV['LD'] = ENV.cxx
 
     system "./configure", *args
     system "make"