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x86.h,x86_simd_caps: add an explicit cast w/strtol

+ use strtoul as mask is unsigned

quiets a -Wshorten-64-to-32 warning

Change-Id: Ia1c24679302100a252da7a45d3bb871f591f1888

--- a/vpx_ports/x86.h

+++ b/vpx_ports/x86.h

@@ -172,7 +172,7 @@

   env = getenv("VPX_SIMD_CAPS_MASK");

   if (env && *env)

-    mask = strtol(env, NULL, 0);

+    mask = (unsigned int)strtoul(env, NULL, 0);

   /* Ensure that the CPUID instruction supports extended features */

   cpuid(0, 0, max_cpuid_val, reg_ebx, reg_ecx, reg_edx);