Remove the INLINE macro

Just use the inline keyword.

Note the changes to build/cmake/aom_config_defaults.cmake and
build/cmake/generate_aom_config_templates.cmake. The rest of the CL was
generated by a series of find/sed commands like these:
  find . -name "*.h" | xargs sed -i -e "s/ INLINE / inline /g"
  find . -name "*.c" | xargs sed -i -e "s/ INLINE / inline /g"
  find . -name "*.cc" | xargs sed -i -e "s/ INLINE / inline /g"
  find . -name "*.h" | xargs sed -i -e "s/ INLINE$/ inline/g"
  ...

Bug: aomedia:358402891
Change-Id: I4c735408ffce6c5f3281a53f0082e2e68d9d495d
diff --git a/av1/encoder/hybrid_fwd_txfm.c b/av1/encoder/hybrid_fwd_txfm.c
index 54f2c7f..4b7fec5 100644
--- a/av1/encoder/hybrid_fwd_txfm.c
+++ b/av1/encoder/hybrid_fwd_txfm.c
@@ -313,7 +313,7 @@
 }
 
 #if CONFIG_AV1_HIGHBITDEPTH
-static INLINE void highbd_wht_fwd_txfm(TX_SIZE tx_size, const int16_t *src_diff,
+static inline void highbd_wht_fwd_txfm(TX_SIZE tx_size, const int16_t *src_diff,
                                        ptrdiff_t src_stride,
                                        tran_low_t *coeff) {
   switch (tx_size) {
@@ -333,7 +333,7 @@
 }
 #endif  // CONFIG_AV1_HIGHBITDEPTH
 
-static INLINE void wht_fwd_txfm(TX_SIZE tx_size, const int16_t *src_diff,
+static inline void wht_fwd_txfm(TX_SIZE tx_size, const int16_t *src_diff,
                                 ptrdiff_t src_stride, tran_low_t *coeff) {
   switch (tx_size) {
     case TX_4X4: aom_hadamard_4x4(src_diff, src_stride, coeff); break;