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build: Use -mcmodel=small on 64-bit Windows

GCC (MinGW) uses -mcmodel=medium by default which results in somewhat
inefficient code, and there's no benefit for us in using that.

--- a/meson.build

+++ b/meson.build

@@ -81,6 +81,8 @@

 # Arguments in test_args will be used even on feature tests

 test_args = []

+optional_arguments = []

+

 # Define _POSIX_C_SOURCE to POSIX.1–2001 (IEEE Std 1003.1-2001)

 test_args  += '-D_POSIX_C_SOURCE=200112L'

 add_project_arguments('-D_POSIX_C_SOURCE=200112L', language: 'c')

@@ -96,10 +98,12 @@

         cdata.set('fseeko', '_fseeki64')

         cdata.set('ftello', '_ftelli64')

     endif

-endif

-# On Windows, we use a compatibility layer to emulate pthread

-if host_machine.system() == 'windows'

+    if (host_machine.cpu_family() == 'x86_64' and cc.get_id() == 'gcc')

+        optional_arguments += '-mcmodel=small'

+    endif

+

+    # On Windows, we use a compatibility layer to emulate pthread

     thread_dependency = []

     thread_compat_dep = declare_dependency(sources : files('src/win32/thread.c'))

 else

@@ -176,7 +180,7 @@

 # Compiler flags that should be set

 # But when the compiler does not supports them

 # it is not an error and silently tolerated

-optional_arguments = [

+optional_arguments += [

   '-Wundef',

   '-Werror=vla',

   '-Wno-maybe-uninitialized',