nvim: init.vim: Fix Neomake for C

Taken from
https://github.com/neomake/neomake/issues/1027

Signed-off-by: Sanchayan Maity <maitysanchayan@gmail.com>

nvim/init.vim

@@ -563,6 +563,11 @@ call neomake#configure#automake({
 " Value of 2 preserves cursor position
 let g:neomake_open_list = 2
 let g:neomake_warning_sign = {'text': '?'}
+let g:neomake_c_enabled_makers = ['gcc']
+let g:neomake_c_gcc_maker = {
+			\ 'exe': 'gcc',
+			\ 'args': ['-Wall', '-Iinclude', '-Wextra', '-Weverything', '-pedantic', '-Wno-sign-conversion'],
+			\ }
 
 " Automatically detect style file and apply style to formatting
 let g:clang_format#detect_style_file = 1