Revert "set WINEGCC only when cross compiling"

WINEGCC is needed for the 'build' part of the configuration, and the build
part does not know anything of actually being setting up cross-compilation.

This reverts commit e7dec288.

configure.in

@@ -6106,8 +6106,8 @@ AC_SUBST(BUILD_EPM)
 dnl ===================================================================
 dnl We need winegcc when building MinGW build to be able to cross-build msi tools
 dnl ===================================================================
+AC_PATH_PROG(WINEGCC, winegcc)
 if test "$WITH_MINGW" = "yes" -a "$PKGFORMAT" = "msi" ; then
-    AC_PATH_PROG(WINEGCC, winegcc)
     if test "$WINEGCC" = ""; then
         AC_MSG_ERROR([winegcc was not found, please install wine-devel, or wine-devel-32bit])
     fi
@@ -6122,7 +6122,6 @@ printf ("hello world\n");
     )
     CC="$CC_save"
 fi
-AC_SUBST(WINEGCC)
 
 dnl ===================================================================
 dnl Check for gperf