add FreeBSD build support (except test/)

Note: NetBSD and OpenBSD has both <endian.h> and <sys/endian.h>

Fixes: https://github.com/alsa-project/alsa-lib/pull/250
Signed-off-by: SASANO Takayoshi <uaa@uaa.org.uk>
Signed-off-by: Jaroslav Kysela <perex@perex.cz>

configure.ac

@@ -764,8 +764,9 @@ AC_OUTPUT(Makefile doc/Makefile doc/pictures/Makefile doc/doxygen.cfg \
 dnl Create asoundlib.h dynamically according to configure options
 echo "Creating asoundlib.h..."
 cp "$srcdir"/include/asoundlib-head.h include/asoundlib.h
+if test "$ac_cv_header_sys_endian_h" != "yes"; then
 test "$ac_cv_header_endian_h" = "yes" && echo "#include <endian.h>" >> include/asoundlib.h
-if test "$ac_cv_header_sys_endian_h" = "yes"; then
+else
 cat >> include/asoundlib.h <<EOF
 #include <sys/endian.h>
 #ifndef __BYTE_ORDER

include/sound/type_compat.h

@@ -22,7 +22,7 @@ typedef int64_t __s64;
 #define __cpu_to_le16 LE_16(x)
 #define __cpu_to_be16 BE_16(x)
 #else
-#include <endian.h>
+#include <sys/endian.h>
 #if __BYTE_ORDER == __LITTLE_ENDIAN
 #define __cpu_to_le32(x) (x)
 #define __cpu_to_be32(x) bswap_32(x)

include/sound/uapi/asound.h

@@ -28,7 +28,7 @@
 #include <linux/types.h>
 #include <asm/byteorder.h>
 #else
-#include <endian.h>
+#include <sys/endian.h>
 #include <sys/ioctl.h>
 #endif
 

src/ucm/ucm_exec.c

@@ -33,7 +33,7 @@
 #include <limits.h>
 #include <dirent.h>
 
-#if defined(__NetBSD__) || defined(__OpenBSD__)
+#if defined(__NetBSD__) || defined(__OpenBSD__) || defined(__FreeBSD__)
 #include <signal.h>
 extern char **environ;
 #endif