fix(libdmr): strip LoongArch out of Platform::Mips

LoongArch is not MIPS-based Loongson and exhibits significantly different
performance characteristics (try ~50 - 100% faster with current hardware
versus 3A4000).

There is no need to strip out functionalities in order to obtain acceptable
performance. The current 3A6000 processors can easily keep up with 10th Gen
Intel i3 processors.

src/libdmr/compositing_manager.cpp

@@ -64,8 +64,7 @@ class PlatformChecker
                     qInfo() << "match shenwei";
                     _pf = Platform::Alpha;
 
-                } else if (machine.find("mips") != string::npos
-                           || machine.find("loongarch64") != string::npos) { // loongson
+                } else if (machine.find("mips") != string::npos) { // MIPS-based Loongson
                     qInfo() << "match loongson";
                     _pf = Platform::Mips;
                 } else if (machine.find("aarch64") != string::npos) { // ARM64

src/libdmr/compositing_manager.h

@@ -17,7 +17,7 @@ namespace dmr {
 enum Platform {
     Unknown,
     X86,  // intel & amd
-    Mips, // loongson
+    Mips, // MIPS-based Loongson
     Alpha, // sunway
     Arm64
 };