build.rs: define HAVE_INTTYPES_H

It is needed by the following files:

    tectonic/dpx-cff_types.h:24:#ifdef HAVE_INTTYPES_H
    tectonic/dpx-dpxcrypt.h:25:#ifdef HAVE_INTTYPES_H
    tectonic/dpx-mem.h:27:#ifdef HAVE_INTTYPES_H
    tectonic/dpx-numbers.h:28:#ifdef HAVE_INTTYPES_H

Since other headers, such as stdint.h, are assumed to exist, we assume
the same for inttypes.h.

Author: ronnychevalier

build.rs

@@ -245,6 +245,7 @@ fn main() {
         .file("tectonic/xetexini.c")
         .file("tectonic/XeTeX_pic.c")
         .define("HAVE_GETENV", Some("1"))
+        .define("HAVE_INTTYPES_H", Some("1"))
         .define("HAVE_LIBPNG", Some("1"))
         .define("HAVE_MKSTEMP", Some("1"))
         .define("HAVE_STDINT_H", Some("1"))