Refactor simd/conf.rb - unnecessary have_type

Remove `have_type` calls because the next `try_compile` calls check
those types.

Author: nobu

ext/json/ext/simd/conf.rb

@@ -2,7 +2,7 @@
 when /^(arm|aarch64)/
   # Try to compile a small program using NEON instructions
   if have_header('arm_neon.h') &&
-     have_type('uint8x16_t', headers=['arm_neon.h']) && try_compile(<<~'SRC')
+     try_compile(<<~'SRC')
       #include <arm_neon.h>
       int main(int argc, char **argv) {
           uint8x16_t test = vdupq_n_u8(32);
@@ -14,7 +14,7 @@
   end
 when /^(x86_64|x64)/
   if have_header('x86intrin.h') &&
-     have_type('__m128i', headers=['x86intrin.h']) && try_compile(<<~'SRC')
+     try_compile(<<~'SRC')
       #include <x86intrin.h>
       int main(int argc, char **argv) {
           __m128i test = _mm_set1_epi8(32);