Fixed MSVC compilation issues

Signed-off-by: Robear Selwans <robear.selwans@outlook.com>

meson.build

@@ -1,4 +1,5 @@
-project('evol-headers', 'c')
+project('evol-headers', 'c',
+  default_options : [ 'c_std=gnu17' ])
 
 headers_include = include_directories('.')
 
@@ -12,6 +13,11 @@ else
   evh_c_args += '-DEV_BUILDTYPE_RELEASE=1'
 endif
 
+cc = meson.get_compiler('c')
+if cc.get_id() == 'msvc'
+  evh_c_args += '/Zc:preprocessor'
+endif
+
 # All other targets should follow the same template
 str_lib = static_library('ev_str', files('buildfiles/ev_str.c'), c_args: evh_c_args)
 vec_lib = static_library('ev_vec', files('buildfiles/ev_vec.c'), c_args: evh_c_args)