Commita82a174

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Silence warnings about redefining popen on Mingw-w64.

Mingw-w64 headers map popen/pclose to _popen and _pclose, but we want to useour popen wrapper rather than the Mingw-w64. #undef the Mingw's version.

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Original file line number	Diff line number	Diff line change
`@@ -301,6 +301,18 @@ extern FILE pgwin32_fopen(const char , const char *);`
`301`	`301`	`#definefopen(a,b) pgwin32_fopen(a,b)`
`302`	`302`	`#endif`
`303`	`303`
	`304`	`+/*`
	`305`	`+ * Mingw-w64 headers #define popen and pclose to _popen and _pclose. We want`
	`306`	`+ * to use our popen wrapper, rather than plain _popen, so override that. For`
	`307`	`+ * consistency, use our version of pclose, too.`
	`308`	`+ */`
	`309`	`+#ifdefpopen`
	`310`	`+#undef popen`
	`311`	`+#endif`
	`312`	`+#ifdefpclose`
	`313`	`+#undef pclose`
	`314`	`+#endif`
	`315`	`+`
`304`	`316`	`/*`
`305`	`317`	`* system() and popen() replacements to enclose the command in an extra`
`306`	`318`	`* pair of quotes.`

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