added checks to control compilation with emscripten

src/runtime/c/pgf/data.h

@@ -16,6 +16,10 @@
 #include <sys/errno.h>
 #endif
 
+#ifdef EMSCRIPTEN
+#include <errno.h>
+#include <stdio.h>
+#endif
 
 class PGF_INTERNAL_DECL pgf_error : public std::runtime_error {
 public:

src/runtime/c/pgf/pgf.h

@@ -132,6 +132,9 @@ typedef struct {
 #elif defined(_WIN32)
 #define LINT_BASE 1000000000
 #define LINT_BASE_LOG 9
+#elif defined(EMSCRIPTEN)
+#define LINT_BASE 10000000000000000000UL
+#define LINT_BASE_LOG 19
 #else
 #error "Unsupported platform"
 #endif