patch 7.4.756
Problem:    Can't use strawberry Perl 5.22 x64 on MS-Windows.
Solution:   Add new defines and #if. (Ken Takata)
diff --git a/src/Make_cyg_ming.mak b/src/Make_cyg_ming.mak
index 1f55a9e..d10817a 100644
--- a/src/Make_cyg_ming.mak
+++ b/src/Make_cyg_ming.mak
@@ -397,7 +397,7 @@
 endif
 
 ifdef PERL
-CFLAGS += -I$(PERLLIBS) -DFEAT_PERL
+CFLAGS += -I$(PERLLIBS) -DFEAT_PERL -DPERL_IMPLICIT_CONTEXT -DPERL_IMPLICIT_SYS
 ifeq (yes, $(DYNAMIC_PERL))
 CFLAGS += -DDYNAMIC_PERL -DDYNAMIC_PERL_DLL=\"perl$(PERL_VER).dll\"
 EXTRA_LIBS += -L$(PERLLIBS) -lperl$(PERL_VER)