tests: added -DHAVE_SIGNAL_H to CFLAGS in watcom makefiles

test/Makefile.os2

@@ -9,6 +9,7 @@ INCPATH = -I"$(%WATCOM)/h/os2" -I"$(%WATCOM)/h"
 
 CFLAGS = -bt=os2 -d0 -q -bm -5s -fp5 -fpi87 -sg -oteanbmier -ei
 CFLAGS+= -wx -wcd=303
+CFLAGS+= -DHAVE_SIGNAL_H
 !ifeq ENABLE_WERROR 1
 CFLAGS+= -we
 !endif

test/Makefile.w32

@@ -13,7 +13,7 @@ CFLAGS+= -wx -wcd=303
 CFLAGS+= -we
 !endif
 CFLAGS+= -DSDL_MAIN_HANDLED
-CFLAGS+= -DHAVE_OPENGL
+CFLAGS+= -DHAVE_OPENGL -DHAVE_SIGNAL_H
 GLLIBS = opengl32.lib
 
 TNSRCS = testnative.c testnativew32.c