#230 isPathJavaVersionGood defined but not declared in header

[Joel Uckelman]

head_src/head.h has the following declaration:

BOOL isJavaPathVersionGood(const char path, BOOL is64Bit);

head_src/heac.c defines and uses this function:

BOOL isPathJavaVersionGood(const char path, BOOL is64Bit)

The declaration should match the definition.