Add better support for the LoongArch architecture

Resolve systemd-bootchart compile failed on Loongson architecture (loongarch).
Fixes #68.

This PR is to provide better support for the Loongson architecture.
References to related PR (systemd/systemd#21288).

Author: prownd

configure.ac

@@ -46,6 +46,7 @@ SET_ARCH(MIPS, mips*)
 SET_ARCH(AARCH64, aarch64*)
 SET_ARCH(RISCV64, riscv64*)
 SET_ARCH(RISCV32, riscv32*)
+SET_ARCH(LOONGARCH64, loongarch64*)
 
 AC_CHECK_SIZEOF(pid_t)
 AC_CHECK_SIZEOF(uid_t)

src/architecture.h

@@ -59,7 +59,7 @@ enum {
         ARCHITECTURE_CRIS,
         ARCHITECTURE_RISCV64,
         ARCHITECTURE_RISCV32,
-	ARCHITECTURE_LOONGARCH,
+        ARCHITECTURE_LOONGARCH64,
         _ARCHITECTURE_MAX,
         _ARCHITECTURE_INVALID = -1
 };
@@ -155,9 +155,9 @@ int uname_architecture(void);
 #elif defined(__riscv) && __riscv_xlen == 32
 #  define native_architecture() ARCHITECTURE_RISCV32
 #  define define LIB_ARCH_TUPLE "riscv32-linux-gnu"
-#elif defined(__loongarch__) && __loongarch_grlen == 64
-#  define native_architecture() ARCHITECTURE_LOONGARCH
-#  define define LIB_ARCH_TUPLE "loongarch64-linux-gnu"
+#elif defined(__loongarch64)
+#    define native_architecture() ARCHITECTURE_LOONGARCH64
+#    define LIB_ARCH_TUPLE "loongarch64-linux-gnu"
 #elif defined(__aarch64__)
 #  if __BYTE_ORDER == __BIG_ENDIAN
 #    define native_architecture() ARCHITECTURE_ARM64_BE