BLD: fix building against compiler that refuses to convert char to in…

…t implicitly

src/erfaversion.c

@@ -12,6 +12,8 @@
  * without it, the macros have to be defined explicitly
  * in the call to the compiler.
  */
+#include <stdlib.h>
+
 #ifdef HAVE_CONFIG_H
 #include <config.h>
 #endif /* HAVE_CONFIG_H */
@@ -23,17 +25,17 @@ const char* eraVersion(void) {
 
 
 int eraVersionMajor(void) {
-  return PACKAGE_VERSION_MAJOR;
+  return (int) atol(PACKAGE_VERSION_MAJOR);
 }
 
 
 int eraVersionMinor(void) {
-  return PACKAGE_VERSION_MINOR;
+  return (int) atol(PACKAGE_VERSION_MINOR);
 }
 
 
 int eraVersionMicro(void) {
-  return PACKAGE_VERSION_MICRO;
+  return (int) atol(PACKAGE_VERSION_MICRO);
 }