annotate ext/json11/Makefile @ 295:de5dc40f1830

Include headers needed to compile with GCC 15's -std=gnu23 default

```
In file included from ../piper-vamp-cpp/vamp-json/VampJson.h:55,
                 from ../piper-vamp-cpp/vamp-server/convert.cpp:36:
../piper-vamp-cpp/vamp-support/PluginHandleMapper.h:69:13: error: ‘uint32_t’ does not name a type
   69 |     typedef uint32_t Handle;
      |             ^~~~~~~~
../piper-vamp-cpp/vamp-support/PluginHandleMapper.h:39:1: note: ‘uint32_t’ is defined in header ‘<cstdint>’; this is probably fixable by adding ‘#include <cstdint>’
   38 | #include "PluginOutputIdMapper.h"
  +++ |+#include <cstdint>
   39 |

../piper-vamp-cpp/ext/json11/json11.cpp: In function ‘void json11::dump(const std::string&, std::string&)’:
../piper-vamp-cpp/ext/json11/json11.cpp:95:32: error: ‘uint8_t’ does not name a type
   95 |         } else if (static_cast<uint8_t>(ch) <= 0x1f) {
      |                                ^~~~~~~
../piper-vamp-cpp/ext/json11/json11.cpp:25:1: note: ‘uint8_t’ is defined in header ‘<cstdint>’; this is probably fixable by adding ‘#include <cstdint>’
   24 | #include <cmath>
  +++ |+#include <cstdint>
   25 | #include <cstdlib>
```

Signed-off-by: Michel Lind <[e-mail]>

# Environment variable to enable or disable code which demonstrates the behavior change
# in Xcode 7 / Clang 3.7, introduced by DR1467 and described here:
# https://llvm.org/bugs/show_bug.cgi?id=23812
# Defaults to on in order to act as a warning to anyone who's unaware of the issue.
ifneq ($(JSON11_ENABLE_DR1467_CANARY),)
CANARY_ARGS = -DJSON11_ENABLE_DR1467_CANARY=$(JSON11_ENABLE_DR1467_CANARY)
endif

test: json11.cpp json11.hpp test.cpp
	$(CXX) $(CANARY_ARGS) -O -std=c++11 json11.cpp test.cpp -o test -fno-rtti -fno-exceptions

clean:
	if [ -e test ]; then rm test; fi

.PHONY: clean