build/loglevel: add build flag hooks for log levels

build/loglevel_critical.go

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+// +build dev,critical
+
+package build
+
+// LogLevel specifies a critical log level.
+var LogLevel = "critical"

build/loglevel_debug.go

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+// +build dev,debug
+
+package build
+
+// LogLevel specifies a debug log level.
+var LogLevel = "debug"

build/loglevel_default.go

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+// +build !info,!debug,!trace,!warn,!error,!critical,!off
+
+package build
+
+// LogLevel specifies a default log level of info.
+var LogLevel = "info"

build/loglevel_error.go

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+// +build dev,error
+
+package build
+
+// LogLevel specifies an error log level.
+var LogLevel = "error"

build/loglevel_info.go

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+// +build dev,info
+
+package build
+
+// LogLevel specifies an info log level.
+var LogLevel = "info"

build/loglevel_off.go

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+// +build dev,off
+
+package build
+
+// LogLevel specifies an off log level.
+var LogLevel = "off"

build/loglevel_trace.go

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+// +build dev,trace
+
+package build
+
+// LogLevel specifies a trace log level.
+var LogLevel = "trace"

build/loglevel_warn.go

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+// +build dev,warn
+
+package build
+
+// LogLevel specifies a warning log level.
+var LogLevel = "warn"