[build] Correct cygwin system type

cygwin is not windows, so trying to build a win32 app on cygwin-native
doesn't work too well.

config.d/cdrom.m4

@@ -59,10 +59,12 @@ AC_SUBST(SGI_CD_LIBS)
 
 AC_EGREP_CPP([QF_maGiC_VALUE],
 	[
+#ifdef _WIN32
 #include <windows.h>
 #include <mmsystem.h>
 #if defined(MCI_SET_DOOR_OPEN)
 QF_maGiC_VALUE
+#endif
 #endif
 	],
 	CDTYPE="$CDTYPE WIN32"

config.d/sound.m4

@@ -238,6 +238,7 @@ QF_maGiC_VALUE
 	fi
 
 	dnl Win32
+	if test "x$SYSTYPE" = xWIN32; then
 		if test "x$ac_cv_header_windows_h" = "xyes"; then
 			SOUND_TYPES="$SOUND_TYPES Win32"
 			QF_NEED(snd_output, [win])
@@ -260,6 +261,7 @@ QF_maGiC_VALUE
 			)
 			fi
 		fi
+	fi
 	AC_SUBST(WINSND_LIBS)
 
 fi

config.d/windows.m4

@@ -19,9 +19,7 @@ case "$host_os" in
 		;;
 	cygwin*)
 		cygwin=yes
-		SYSTYPE=WIN32
 		AC_DEFINE(NEED_GNUPRINTF)
-		FNM_FLAGS="-I\$(top_srcdir)/include/win32"
 		if test "x$host" != "x$build"; then
 			CC="$host_cpu-$host_os-gcc"
 			AS="$CC"

configure.ac

@@ -91,7 +91,7 @@ case "${host}" in
 
 		;;
 	i?86-*-cygwin*|x86_64-*-cygwin*)
-		SYSTYPE=WIN32
+		#SYSTYPE=WIN32
 		AC_MSG_RESULT([Win32 driver])
 		WIN32_LIBS=' $(NET_LIBS)'
 		;;

libs/util/sys.c

@@ -940,7 +940,11 @@ Sys_ConsoleInput (void)
 #endif
 }
 
+#ifdef _WIN32
 static jmp_buf  aiee_abort;
+#else
+static sigjmp_buf aiee_abort;
+#endif
 
 typedef struct sh_stack_s {
 	struct sh_stack_s *next;