[PATCH] lib/curl_poll.h: fix header guard collision with musl libc

The musl libc uses the _POLL_H macro as a double include guard for the poll.h
header. This breaks compilation of files the include curl_poll.h:

In file included from driver.h:32:0,
                 from driver.c:12:
lirc/curl_poll.h:38:29: error: array type has incomplete element type ‘struct pollfd’
 int curl_poll(struct pollfd ufds[], unsigned int nfds, int timeout_ms);
                             ^~~~

Rename the curl_poll.h header guard macro to avoid collision. Don't use a name
that starts with an underscore and a capital letter since these names are
reserved according to the ANSI C standard.

https://www.gnu.org/software/libc/manual/html_node/Reserved-Names.html

Signed-off-by: Baruch Siach <[email protected]>
---
 lib/curl_poll.h | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/lib/curl_poll.h b/lib/curl_poll.h
index c8813859eca6..c0162b66718b 100644
--- a/lib/curl_poll.h
+++ b/lib/curl_poll.h
@@ -1,5 +1,5 @@
-#ifndef _POLL_H
-#define _POLL_H
+#ifndef HEADER_LIB_CURL_POLL_H
+#define HEADER_LIB_CURL_POLL_H
 /***************************************************************************
  *                                  _   _ ____  _
  *  Project                     ___| | | |  _ \| |
@@ -44,4 +44,4 @@ int curl_poll(struct pollfd ufds[], unsigned int nfds, int timeout_ms);
 #endif
 
 
-#endif /* _POLL_H */
+#endif /* HEADER_LIB_CURL_POLL_H */
-- 
2.11.0


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