Patch adapted from [1]:

	musl doesn't expose these sysconf values, so just use the loop
	below that reads them out of sysfs coherency_line_size only

For the __pagesize bit, this is currently only used on arm64 and aborts
if __pagesize != GetRuntimePageSize -- so, as a wishful thinking solution,
have it return __pagesize.

[1] https://github.com/chimera-linux/cports/blob/114b576aee3ebc25b48ac120da1a1093dcc4365f/user/pcsx2/patches/cache.patch
--- a/common/Linux/LnxHostSys.cpp
+++ b/common/Linux/LnxHostSys.cpp
@@ -93,6 +93,10 @@
 size_t HostSys::GetRuntimePageSize()
 {
+#if defined(__GLIBC__)
 	int res = sysconf(_SC_PAGESIZE);
 	return (res > 0) ? static_cast<size_t>(res) : 0;
+#else
+	return __pagesize;
+#endif
 }
 
@@ -115,7 +119,11 @@
 	return static_cast<size_t>(max_line_size);
 #else
+#if defined(__GLIBC__)
 	int l1i = sysconf(_SC_LEVEL1_DCACHE_LINESIZE);
 	int l1d = sysconf(_SC_LEVEL1_ICACHE_LINESIZE);
 	int res = (l1i > l1d) ? l1i : l1d;
+#else
+	int res = 0;
+#endif
 	for (int index = 0; index < 16; index++)
 	{