\pdfcolorstack is always defined

pdftex.def

@@ -115,15 +115,6 @@
   }%
 }
 
-\ltx@IfUndefined{pdfcolorstack}{%
-  \def\set@color{%
-    \pdfliteral{\current@color}%
-    \aftergroup\reset@color
-  }%
-  \def\reset@color{%
-    \pdfliteral{\current@color}%
-  }%
-}{%
   \chardef\main@pdfcolorstack=0 %
   \@ifundefined{@pdfcolorstack}{%
     \def\@pdfcolorstack{\main@pdfcolorstack}%
@@ -135,7 +126,6 @@
   \def\reset@color{%
     \pdfcolorstack\@pdfcolorstack pop\relax
   }%
-}
 \def\define@color@named#1#2{%
   \expandafter\edef\csname col@#1\endcsname{#2}%
 }
@@ -216,38 +206,6 @@ E     \else
 }
 \catcode`\X=11 %
 \catcode`\E=11 %
-
-% Need the `colorfix' modifications as no internal colour stack
-% is maintained
-%<*colorfix>
-\begingroup\expandafter\expandafter\expandafter\endgroup
-\expandafter\ifx\csname pdfcolorstack\endcsname\relax
-  \AtBeginDocument{%
-    \begingroup\expandafter\expandafter\expandafter\endgroup
-    \expandafter\ifx\csname color\endcsname\relax
-      % Without color we don't need any fixes.
-    \else
-      \ltx@ifundefined{@ldc@l@r}{%
-        \let\@ldc@l@r\color
-        \def\color{%
-          \ltx@IfUndefined{if@inlabel}{}{%
-            \csname if@inlabel\expandafter\endcsname
-            \expandafter\leavevmode\csname fi\endcsname
-          }%
-          \@ldc@l@r
-        }%
-      }{}%
-      \ltx@ifundefined{@lduseb@x}{%
-        \ltx@IfUndefined{usebox}{}{%
-          \let\@lduseb@x\usebox
-          \def\usebox#1{\@lduseb@x{#1}\reset@color}%
-        }%
-      }{}%
-    \fi
-  }%
-\fi
-%</colorfix>
-
 %
 % Graphic inclusion. Currently supports .png, .jpg, .mps and .pdf inclusion;
 % .tif support is dropped since pdfTeX 1.10a.