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[PATCH] git-compat-util: prefer poll.h to sys/poll.h

POSIX specifies that <poll.h> is the correct header for poll(2)
whereas <sys/poll.h> is only needed for some old libc.

Let's follow the POSIX way by default.

This effectively eliminates musl's warning:

    warning redirecting incorrect #include <sys/poll.h> to <poll.h>

Signed-off-by: Đoàn Trần Công Danh <congdanhqx@xxxxxxxxx>
t0028, t1308.23, t3900.34 is failing under musl,
Those test cases in question also fails without this patch.

- t0028 is failing because musl `iconv` output UTF-16 without BOM.
I'm not sure if my installation is broken, or it's musl's default behavior.
But, I think RFC2781, section 4.3 allows the missing BOM

- t1308.23 is failing because musl `fopen` is success when open directory
in readonly mode. POSIX allows this behavior:
The named file is a directory and mode requires write access.

- t3900.34: from what I understand, musl haven't supported ISO-2022-JP, yet.

 Makefile          | 8 +++++++-
 configure.ac      | 6 ++++++
 git-compat-util.h | 5 ++++-
 3 files changed, 17 insertions(+), 2 deletions(-)

diff --git a/Makefile b/Makefile
index bbfbb4292..5734efe74 100644
--- a/Makefile
+++ b/Makefile
@@ -207,10 +207,12 @@ all::
 # Define MMAP_PREVENTS_DELETE if a file that is currently mmapped cannot be
 # deleted or cannot be replaced using rename().
+# Define NO_POLL_H if you don't have poll.h.
 # Define NO_SYS_POLL_H if you don't have sys/poll.h.
 # Define NO_POLL if you do not have or don't want to use poll().
-# This also implies NO_SYS_POLL_H.
+# This also implies NO_POLL_H and NO_SYS_POLL_H.
 # Define NEEDS_SYS_PARAM_H if you need to include sys/param.h to compile,
 # *PLEASE* REPORT to git@xxxxxxxxxxxxxxx if your platform needs this;
@@ -1459,6 +1461,7 @@ ifdef NO_GETTEXT
 	USE_GETTEXT_SCHEME ?= fallthrough
 ifdef NO_POLL
+	NO_POLL_H = YesPlease
 	NO_SYS_POLL_H = YesPlease
 	COMPAT_CFLAGS += -DNO_POLL -Icompat/poll
 	COMPAT_OBJS += compat/poll/poll.o
@@ -1497,6 +1500,9 @@ endif
+ifdef NO_POLL_H
 ifdef NO_SYS_POLL_H
diff --git a/configure.ac b/configure.ac
index e11b7976a..908e66a97 100644
--- a/configure.ac
+++ b/configure.ac
@@ -792,6 +792,12 @@ AC_CHECK_HEADER([sys/select.h],
+# Define NO_POLL_H if you don't have poll.h
 # Define NO_SYS_POLL_H if you don't have sys/poll.h
diff --git a/git-compat-util.h b/git-compat-util.h
index 96a3f86d8..65f229f10 100644
--- a/git-compat-util.h
+++ b/git-compat-util.h
@@ -180,9 +180,12 @@
 #include <regex.h>
 #include <utime.h>
 #include <syslog.h>
-#ifndef NO_SYS_POLL_H
+#if !defined(NO_POLL_H)
+#include <poll.h>
+#elif !defined(NO_SYS_POLL_H)
 #include <sys/poll.h>
+/* Pull the compat stuff */
 #include <poll.h>