[meson] has_function detection needs suitable includes

- fix meson has_function() detection, needs suitable include to avoid
  false positive (see [1] for details)

[1] https://github.com/mesonbuild/meson/issues/7652

Closes #4266

Signed-off-by: Peter Seiderer <ps.report@gmx.net>

meson.build

@@ -72,15 +72,15 @@ check_headers = [
 ]
 
 check_funcs = [
-  ['atexit'],
-  ['mprotect'],
-  ['sysconf'],
-  ['getpagesize'],
-  ['mmap'],
-  ['isatty'],
-  ['uselocale'],
-  ['newlocale'],
-  ['sincosf'],
+  ['atexit', {'prefix': '#include <stdlib.h>'}],
+  ['mprotect', {'prefix': '#include <sys/mman.h>'}],
+  ['sysconf', {'prefix': '#include <unistd.h>'}],
+  ['getpagesize', {'prefix': '#include <unistd.h>'}],
+  ['mmap', {'prefix': '#include <sys/mman.h>'}],
+  ['isatty', {'prefix': '#include <unistd.h>'}],
+  ['uselocale', {'prefix': '#include <locale.h>'}],
+  ['newlocale', {'prefix': '#include <locale.h>'}],
+  ['sincosf', {'prefix': '#define _GNU_SOURCE\n#include <math.h>'}],
 ]
 
 m_dep = cpp.find_library('m', required: false)
@@ -356,11 +356,12 @@ foreach check : check_funcs
   opts = check.get(1, {})
   link_withs = opts.get('link_with', [])
   check_deps = opts.get('deps', [])
+  check_prefix = opts.get('prefix', '')
   extra_deps = []
   found = true
 
   # First try without linking
-  found = cpp.has_function(name, dependencies: check_deps)
+  found = cpp.has_function(name, prefix: check_prefix, dependencies: check_deps)
 
   if not found and link_withs.length() > 0
     found = true
@@ -375,7 +376,7 @@ foreach check : check_funcs
     endforeach
 
     if found
-      found = cpp.has_function(name, dependencies: check_deps + extra_deps)
+      found = cpp.has_function(name, prefix: check_prefix, dependencies: check_deps + extra_deps)
     endif
   endif