Updated macros from libgphoto2, fixes compile warnings.
diff --git a/configure.ac b/configure.ac
index e5f32e9..0e5398e 100644
--- a/configure.ac
+++ b/configure.ac
@@ -94,7 +94,7 @@
# that will always be available. The <stdint.h> file is required by the
# library, but we provide this anyway because the libptp2 stuff wants this
# file.
-AX_NEED_STDINT_H([src/libptp-stdint.h])
+AX_NEED_STDINT_H([src/_stdint.h])
# Create a header file containing NetBSD-style byte swapping macros.
# This m4 macros has caused severe pain, I am considering creating a