Implement go-gitea/gitea#1107 and go-gitea/gitea#815 fixes for building bolt on mips platforms.

bolt_mips.go

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+// +build mips
+package bolt
+
+// maxMapSize represents the largest mmap size supported by Bolt.
+const maxMapSize = 0x40000000 // 1GB
+
+// maxAllocSize is the size used when creating array pointers.
+const maxAllocSize = 0xFFFFFFF
+
+// brokenUnaligned Are unaligned load/stores broken on this arch?
+var brokenUnaligned = false

bolt_mips64.go

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+// +build mips64
+package bolt
+
+// maxMapSize represents the largest mmap size supported by Bolt.
+const maxMapSize = 0xFFFFFFFFFFFF // 256TB
+
+// maxAllocSize is the size used when creating array pointers.
+const maxAllocSize = 0x7FFFFFFF
+
+// brokenUnaligned Are unaligned load/stores broken on this arch?
+var brokenUnaligned = false

bolt_mips64le.go

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+// +build mips64le
+package bolt
+
+// maxMapSize represents the largest mmap size supported by Bolt.
+const maxMapSize = 0xFFFFFFFFFFFF // 256TB
+
+// maxAllocSize is the size used when creating array pointers.
+const maxAllocSize = 0x7FFFFFFF
+
+// brokenUnaligned Are unaligned load/stores broken on this arch?
+var brokenUnaligned = false

bolt_mipsle.go

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+// +build mipsle
+package bolt
+
+// maxMapSize represents the largest mmap size supported by Bolt.
+const maxMapSize = 0x40000000 // 1GB
+
+// maxAllocSize is the size used when creating array pointers.
+const maxAllocSize = 0xFFFFFFF
+
+// brokenUnaligned Are unaligned load/stores broken on this arch?
+var brokenUnaligned = false