srand() & simple rand() supporing seed
use js variable for rand_seed
Revert "use js variable for rand_seed"

This reverts commit 3e31f83ac762e34b266b7888aec161bb2b843dd1.
fix rand_r; add rand_r in test_rand
support precompiled headers; fixes #2045
add alIsSource
add alcGetIntegerv
improve alGetString
silence poppler stdout output, so it is suitable as a benchmark
finish precompiled headers test; fixes #2045
improve mem init help text; fixes #2066
add testcase with longjmp and c++ exception catching in the same function
fix some safeHeap errors with the new exceptions code; fixes #2068
comment
EM_ASM_ variants that return a value but receive no inputs; fixes #2070
alGetString fixes from review
improve alcGetString
alcGetIntegerv fixes
add alGetBufferi
start to add tests