runtime: use mincore to detect physical page size as last resort on Android
runtime: use mincore to detect physical page size as last resort on Android

Fixes #18041.

Change-Id: Iad1439b2dd56b113c8829699eda467d1367b0e15
Reviewed-on: https://go-review.googlesource.com/34610
Reviewed-by: Austin Clements <7ea35d812706d9213868749011af1ed4fa2f6aa0@google.com>

codestation/go,codestation/go,polyverse-security/go,codestation/go,vsekhar/elastic-go,polyverse-security/go,codestation/go,vsekhar/elastic-go,nawawi/go,cloudflare/go,ImJasonH/go,golang/go,derekmarcotte/go,suncycheng/go,nawawi/go,josharian/go,linux-on-ibm-z/go,derekmarcotte/go,golang/go,cloudflare/go,Cofyc/go,josharian/go,vsekhar/elastic-go,akutz/go,akutz/go,nawawi/go,cloudflare/go,Cofyc/go,josharian/go,CAFxX/go,Cofyc/go,suncycheng/go,Cofyc/go,codestation/go,josharian/go,CAFxX/go,cloudflare/go,akutz/go,nawawi/go,golang/go,Cofyc/go,akutz/go,Cofyc/go,ImJasonH/go,suncycheng/go,ImJasonH/go,golang/go,josharian/go,derekmarcotte/go,vsekhar/elastic-go,akutz/go,CAFxX/go,vsekhar/elastic-go,nawawi/go,polyverse-security/go,josharian/go,ImJasonH/go,CAFxX/go,Cofyc/go,polyverse-security/go,nawawi/go,derekmarcotte/go,suncycheng/go,cloudflare/go,polyverse-security/go,linux-on-ibm-z/go,linux-on-ibm-z/go,cloudflare/go,CAFxX/go,ImJasonH/go,codestation/go,golang/go,linux-on-ibm-z/go,vsekhar/elastic-go,CAFxX/go,golang/go,nawawi/go,golang/go,suncycheng/go,akutz/go,ImJasonH/go,cloudflare/go,ImJasonH/go,derekmarcotte/go,derekmarcotte/go,CAFxX/go,christopher-henderson/Go,polyverse-security/go,ImJasonH/go,CAFxX/go,Cofyc/go,cloudflare/go,polyverse-security/go,suncycheng/go,suncycheng/go,akutz/go,josharian/go,nawawi/go,codestation/go,linux-on-ibm-z/go,suncycheng/go,derekmarcotte/go,akutz/go,codestation/go,polyverse-security/go,vsekhar/elastic-go,vsekhar/elastic-go,linux-on-ibm-z/go,golang/go,derekmarcotte/go,linux-on-ibm-z/go,josharian/go,linux-on-ibm-z/go