Typos in luamath

Author: hmenke

tex/generic/pgf/libraries/luamath/pgflibraryluamath.code.tex

@@ -299,7 +299,7 @@
   \pgfluamath@install@function\pgfmathsubtract@=\pgfluamathsubtract@%
   \pgfluamath@install@function\pgfmathneg@=\pgfluamathneg@%
   \pgfluamath@install@function\pgfmathmultiply@=\pgfluamathmultiply@%
-  \pgfmathfloat@install\pgfmath@iftrue=\pgfmathluamath@iftrue%
+  \pgfluamath@install@function\pgfmath@iftrue=\pgfmathluamath@iftrue%
   \pgfluamath@install@function\pgfmathdivide@=\pgfluamathdivide@%
   % \pgfluamath@install@function\pgfmathdiv@=\pgfluamathdiv@%
   \pgfluamath@install@function\pgfmathfactorial@=\pgfluamathfactorial@%
@@ -406,7 +406,7 @@
 \def\pgfluamathadd@#1#2{%
   \pgfluamathgetresult{pgfluamathfunctions.add(#1,#2)}}%
 \def\pgfluamathsubtract@#1#2{%
-  \pgfluamathgetresult{pgfluamathfunctions.substract(#1,#2)}}%
+  \pgfluamathgetresult{pgfluamathfunctions.subtract(#1,#2)}}%
 \def\pgfluamathneg@#1{%
   \pgfluamathgetresult{pgfluamathfunctions.neg(#1)}}%
 \def\pgfluamathmultiply@#1#2{%