BaseTools: change non-ASCII characters in LinuxGcc5ToolChain.py

Commit ea56fa3d47 ("BaseTools: Enable RISC-V architecture for RISC-V
EDK2 CI") introduced a UTF-8 NBSP (0xc2a0) inside a comment block
otherwise copied identically from pre-existing architectures.
This was clearly unintentional and confuses things when looking for
which files contain UTF-8 encodings, so change it to good old 0x20.

Signed-off-by: Leif Lindholm <quic_llindhol@quicinc.com>

BaseTools/Plugin/LinuxGcc5ToolChain/LinuxGcc5ToolChain.py

@@ -99,7 +99,7 @@ class LinuxGcc5ToolChain(IUefiBuildPlugin):
         return 0
 
     def _check_riscv64(self):
-        # now check for install dir.  If set then set the Prefix
+        # now check for install dir.  If set then set the Prefix
         install_path = shell_environment.GetEnvironment(
         ).get_shell_var("GCC5_RISCV64_INSTALL")
         if install_path is None: