libuv-devel needs clock_gettime

[barracuda156]

​https://build.macports.org/builders/ports-10.11_x86_64-builder/builds/248936/steps/install-port/logs/stdio

libtool: compile:  /usr/bin/clang -DPACKAGE_NAME=\"libuv\" -DPACKAGE_TARNAME=\"libuv\" -DPACKAGE_VERSION=\"1.47.0\" "-DPACKAGE_STRING=\"libuv 1.47.0\"" -DPACKAGE_BUGREPORT=\"https://github.com/libuv/libuv/issues\" -DPACKAGE_URL=\"\" -DPACKAGE=\"libuv\" -DVERSION=\"1.47.0\" -DSUPPORT_ATTRIBUTE_VISIBILITY_DEFAULT=1 -DSUPPORT_FLAG_VISIBILITY=1 -DHAVE_STDIO_H=1 -DHAVE_STDLIB_H=1 -DHAVE_STRING_H=1 -DHAVE_INTTYPES_H=1 -DHAVE_STDINT_H=1 -DHAVE_STRINGS_H=1 -DHAVE_SYS_STAT_H=1 -DHAVE_SYS_TYPES_H=1 -DHAVE_UNISTD_H=1 -DSTDC_HEADERS=1 -DHAVE_DLFCN_H=1 -DLT_OBJDIR=\".libs/\" -DHAVE_PTHREAD_PRIO_INHERIT=1 -I. -I./include -I./src -I./src/unix -I/opt/local/include -fno-strict-aliasing -g -std=gnu89 -Wall -Wextra -Wno-long-long -Wno-unused-parameter -Wstrict-prototypes -D_DARWIN_USE_64_BIT_INODE=1 -D_DARWIN_UNLIMITED_SELECT=1 -pipe -Os -arch x86_64 -fvisibility=hidden -Qunused-arguments -pthread -MT src/unix/libuv_la-async.lo -MD -MP -MF src/unix/.deps/libuv_la-async.Tpo -c src/unix/async.c -o src/unix/libuv_la-async.o >/dev/null 2>&1
src/unix/core.c:124:11: warning: implicit declaration of function 'clock_gettime' [-Wimplicit-function-declaration]
      r = clock_gettime(CLOCK_MONOTONIC, &t);
          ^
src/unix/core.c:124:25: error: use of undeclared identifier 'CLOCK_MONOTONIC'; did you mean 'UV_CLOCK_MONOTONIC'?
      r = clock_gettime(CLOCK_MONOTONIC, &t);
                        ^~~~~~~~~~~~~~~
                        UV_CLOCK_MONOTONIC
./include/uv.h:356:3: note: 'UV_CLOCK_MONOTONIC' declared here
  UV_CLOCK_MONOTONIC,
  ^
src/unix/core.c:127:25: error: use of undeclared identifier 'CLOCK_REALTIME'; did you mean 'UV_CLOCK_REALTIME'?
      r = clock_gettime(CLOCK_REALTIME, &t);
                        ^~~~~~~~~~~~~~
                        UV_CLOCK_REALTIME
./include/uv.h:357:3: note: 'UV_CLOCK_REALTIME' declared here
  UV_CLOCK_REALTIME
  ^
1 warning and 2 errors generated.

Looks like we need legacysupport through Darwin 15.

[herbygillot (Herby Gillot)]

In a6629afdd2fafebec2c3c1ecf38d141cb4084a1c/macports-ports (master):

libuv-devel: add legacysupport for clock_gettime

Fixes: #69127