Add missing math functions

1. Add sincos, sincosf, and sincosl to API >= 9 (for ARM only,
   because X86 and MIPS have it already)
2. Add nan, nanf, nanl, and tgammaf to API >= 13 (11 actually,
   but we don't want to add another API which is not released)
3. Add log2, log2f, log2l, logbl, nexttoward, and nexttowardl to
   API >= 18

See b.android.com/38423

Change-Id: I0a756aeeddafc3862f3c0ae38218cb3301608231

Author: Andrew Hsieh

ndk/platforms/android-13/arch-arm/symbols/libm.so.functions.txt

@@ -0,0 +1,233 @@
+__addsf3
+__aeabi_cfcmpeq
+__aeabi_cfcmple
+__aeabi_cfrcmple
+__aeabi_d2lz
+__aeabi_d2uiz
+__aeabi_d2ulz
+__aeabi_dcmpun
+__aeabi_f2iz
+__aeabi_f2lz
+__aeabi_f2ulz
+__aeabi_fadd
+__aeabi_fcmpeq
+__aeabi_fcmpge
+__aeabi_fcmpgt
+__aeabi_fcmple
+__aeabi_fcmplt
+__aeabi_fcmpun
+__aeabi_fdiv
+__aeabi_fmul
+__aeabi_frsub
+__aeabi_fsub
+__aeabi_i2f
+__aeabi_l2f
+__aeabi_ui2f
+__aeabi_ul2f
+__cmpsf2
+__divsf3
+__eqsf2
+__exp__D
+__fixdfdi
+__fixsfdi
+__fixsfsi
+__fixunsdfdi
+__fixunsdfsi
+__fixunssfdi
+__floatdisf
+__floatsisf
+__floatundisf
+__floatunsisf
+__fpclassifyd
+__fpclassifyf
+__fpclassifyl
+__gesf2
+__gtsf2
+__ieee754_rem_pio2
+__ieee754_rem_pio2f
+__isfinite
+__isfinitef
+__isfinitel
+__isinf
+__isinff
+__isinfl
+__isnanl
+__isnormal
+__isnormalf
+__isnormall
+__kernel_cos
+__kernel_cosdf
+__kernel_rem_pio2
+__kernel_sin
+__kernel_sindf
+__kernel_tan
+__kernel_tandf
+__lesf2
+__log__D
+__ltsf2
+__mulsf3
+__nesf2
+__signbit
+__signbitf
+__signbitl
+__subsf3
+__unorddf2
+__unordsf2
+acos
+acosf
+acosh
+acoshf
+asin
+asinf
+asinh
+asinhf
+atan
+atan2
+atan2f
+atanf
+atanh
+atanhf
+cbrt
+cbrtf
+ceil
+ceilf
+ceill
+copysign
+copysignf
+copysignl
+cos
+cosf
+cosh
+coshf
+drem
+dremf
+erf
+erfc
+erfcf
+erff
+exp
+exp2
+exp2f
+expf
+expm1
+expm1f
+fabs
+fabsf
+fabsl
+fdim
+fdimf
+fdiml
+finite
+finitef
+floor
+floorf
+floorl
+fma
+fmaf
+fmax
+fmaxf
+fmaxl
+fmin
+fminf
+fminl
+fmod
+fmodf
+frexp
+frexpf
+gamma
+gamma_r
+gammaf
+gammaf_r
+hypot
+hypotf
+ilogb
+ilogbf
+ilogbl
+isnan
+isnanf
+j0
+j0f
+j1
+j1f
+jn
+jnf
+ldexp
+ldexpf
+ldexpl
+lgamma
+lgamma_r
+lgammaf
+lgammaf_r
+llrint
+llrintf
+llround
+llroundf
+llroundl
+log
+log10
+log10f
+log1p
+log1pf
+logb
+logbf
+logf
+lrint
+lrintf
+lround
+lroundf
+lroundl
+modf
+modff
+nan
+nanf
+nanl
+nearbyint
+nearbyintf
+nextafter
+nextafterf
+nexttowardf
+pow
+powf
+remainder
+remainderf
+remquo
+remquof
+rint
+rintf
+round
+roundf
+roundl
+scalb
+scalbf
+scalbln
+scalblnf
+scalblnl
+scalbn
+scalbnf
+scalbnl
+significand
+significandf
+sin
+sincos
+sincosf
+sincosl
+sinf
+sinh
+sinhf
+sqrt
+sqrtf
+tan
+tanf
+tanh
+tanhf
+tgamma
+tgammaf
+trunc
+truncf
+truncl
+y0
+y0f
+y1
+y1f
+yn
+ynf

ndk/platforms/android-13/arch-arm/symbols/libm.so.variables.txt

@@ -0,0 +1,2 @@
+__fe_dfl_env
+signgam