libc: move imaxabs to inttypes.zig and don't use cInclude

Author: kada49

lib/c.zig

@@ -16,6 +16,7 @@ else
 comptime {
     if (builtin.target.isMuslLibC() or builtin.target.isWasiLibC()) {
         // Files specific to musl and wasi-libc.
+        _ = @import("c/inttypes.zig");
         _ = @import("c/stdlib.zig");
         _ = @import("c/string.zig");
         _ = @import("c/strings.zig");

lib/c/inttypes.zig

@@ -0,0 +1,11 @@
+const std = @import("std");
+const common = @import("common.zig");
+const intmax_t = std.c.intmax_t;
+
+comptime {
+    @export(&imaxabs, .{ .name = "imaxabs", .linkage = common.linkage, .visibility = common.visibility });
+}
+
+fn imaxabs(a: intmax_t) callconv(.c) intmax_t {
+    return if (a > 0) a else -a;
+}

lib/c/stdlib.zig

@@ -1,13 +1,8 @@
 const std = @import("std");
 const common = @import("common.zig");
-const c = @cImport({
-    @cInclude("stdint.h");
-});
-const c_intmax_t = c.intmax_t;
 
 comptime {
     @export(&abs, .{ .name = "abs", .linkage = common.linkage, .visibility = common.visibility });
-    @export(&imaxabs, .{ .name = "imaxabs", .linkage = common.linkage, .visibility = common.visibility });
     @export(&labs, .{ .name = "labs", .linkage = common.linkage, .visibility = common.visibility });
     @export(&llabs, .{ .name = "llabs", .linkage = common.linkage, .visibility = common.visibility });
 }
@@ -16,10 +11,6 @@ fn abs(a: c_int) callconv(.c) c_int {
     return if (a > 0) a else -a;
 }
 
-fn imaxabs(a: c_intmax_t) callconv(.c) c_intmax_t {
-    return if (a > 0) a else -a;
-}
-
 fn labs(a: c_long) callconv(.c) c_long {
     return if (a > 0) a else -a;
 }

lib/std/c.zig

@@ -10796,6 +10796,9 @@ else
         b: c_longdouble,
     };
 
+pub const intmax_t = i64;
+pub const uintmax_t = u64;
+
 pub extern "c" fn pthread_getthreadid_np() c_int;
 pub extern "c" fn pthread_set_name_np(thread: pthread_t, name: [*:0]const u8) void;
 pub extern "c" fn pthread_get_name_np(thread: pthread_t, name: [*:0]u8, len: usize) void;