msvcrt: remove hack

[Austin English]

This was added 12 years ago in 1db20bfd33f9c1486a1a662c2f78f45d00caf24b

but clang doesn't like it:
clang -m32 -c -I. -I. -I../../include -I../../include  -D__WINESRC__
-D_MT -D_REENTRANT -fPIC -Wall -pipe -fno-strict-aliasing
-Wdeclaration-after-statement -Wempty-body -Wignored-qualifiers
-Wstrict-prototypes -Wtype-limits -Wwrite-strings -Wpointer-arith
-gdwarf-2 -gstrict-dwarf -fno-omit-frame-pointer  -g -O2  -o process.o
process.c
process.c:363:10: warning: explicitly assigning a variable of type
'int' to itself [-Wself-assign]
  action = action; /* Remove warning */
  ~~~~~~ ^ ~~~~~~
1 warning generated.

and no modern gcc/other compiler that I can find cares.

--
-Austin