Fix for building on musl 1.2.4 and above due to deprecation of LFS64 interfaces.

Bug: https://bugs.gentoo.org/908670
Upstream Commit: https://github.com/aristocratos/btop/commit/7e50b03e391a346b2b6ce92be332c58d91f75a000w

With hunks from:
From af7d5086fce8d995f3f8b10677d107a1124a12bf Mon Sep 17 00:00:00 2001
From: "Jakob P. Liljenberg" <admin@qvantnet.com>
Date: Thu, 15 Jun 2023 17:45:05 +0200
Subject: [PATCH] Merge pull request #510 from nobounce/LLVM
--- a/src/linux/btop_collect.cpp
+++ b/src/linux/btop_collect.cpp
@@ -1079,9 +1079,9 @@ namespace Mem {
 				bool new_ignored = false;
 				for (auto& [mountpoint, disk] : disks) {
 					if (std::error_code ec; not fs::exists(mountpoint, ec) or v_contains(ignore_list, mountpoint)) continue;
-					struct statvfs64 vfs;
-					if (statvfs64(mountpoint.c_str(), &vfs) < 0) {
-						Logger::warning("Failed to get disk/partition stats for mount \""+ mountpoint + "\" with statvfs64 error code: " + to_string(errno) + ". Ignoring...");
+					struct statvfs vfs;
+					if (statvfs(mountpoint.c_str(), &vfs) < 0) {
+						Logger::warning("Failed to get disk/partition stats for mount \""+ mountpoint + "\" with statvfs error code: " + to_string(errno) + ". Ignoring...");
 						ignore_list.push_back(mountpoint);
 						new_ignored = true;
 						continue;
--- a/Makefile
+++ b/Makefile
@@ -130,8 +156,8 @@ override GOODFLAGS := $(foreach flag,$(TESTFLAGS),$(strip $(shell echo "int main
 #? Flags, Libraries and Includes
 override REQFLAGS   := -std=c++20
 WARNFLAGS			:= -Wall -Wextra -pedantic
 OPTFLAGS			:= -O2 -ftree-loop-vectorize -flto=$(THREADS)
-LDCXXFLAGS			:= -pthread -D_FORTIFY_SOURCE=2 -D_GLIBCXX_ASSERTIONS $(GOODFLAGS) $(ADDFLAGS)
+LDCXXFLAGS			:= -pthread -D_FORTIFY_SOURCE=2 -D_GLIBCXX_ASSERTIONS -D_FILE_OFFSET_BITS=64 $(GOODFLAGS) $(ADDFLAGS)
 override CXXFLAGS	+= $(REQFLAGS) $(LDCXXFLAGS) $(OPTFLAGS) $(WARNFLAGS)
 override LDFLAGS	+= $(LDCXXFLAGS) $(OPTFLAGS) $(WARNFLAGS)
 INC					:= -I$(INCDIR) -I$(SRCDIR)
-- 
2.41.0