emulators/xsystem35: unbreak build with clang 15

nDEMO.c:22:6: error: incompatible pointer to integer conversion initializing 'int' with an expression of type 'int *'; dereference with * [-Wint-conversion]

int p1 = getCaliVariable();
    ^    ~~~~~~~~~~~~~~~~~
         *

nDEMO.c:28:6: error: incompatible pointer to integer conversion initializing 'int' with an expression of type 'int *'; dereference with * [-Wint-conversion]

int p1 = getCaliVariable();
    ^    ~~~~~~~~~~~~~~~~~
         *

nt_msg.c:189:9: error: incompatible integer to pointer conversion initializing 'char *' with an expression of type 'int' [-Wint-conversion]

char *b = sjis2euc(msg);
      ^   ~~~~~~~~~~~~~

nt_msg.c:261:10: error: incompatible integer to pointer conversion initializing 'char *' with an expression of type 'int' [-Wint-conversion]

char *b = sjis2euc(mbuf);
      ^   ~~~~~~~~~~~~~~

sactcg.c:211:9: error: incompatible integer to pointer conversion initializing 'char *' with an expression of type 'int' [-Wint-conversion]

char *b = sjis2euc(cText);
      ^   ~~~~~~~~~~~~~~~

Reported by: pkg-fallout

(cherry picked from commit 3968779d8b3bc78928f508f2d90a9f30eb633f32)